{"id":2565,"date":"2023-04-01T07:02:55","date_gmt":"2023-04-01T07:02:55","guid":{"rendered":"https:\/\/www.overcharts.com\/en\/helpcenter\/?post_type=docs&#038;p=2565"},"modified":"2025-01-31T11:29:02","modified_gmt":"2025-01-31T11:29:02","password":"","slug":"universal-dde","status":"publish","type":"docs","link":"https:\/\/www.overcharts.com\/en\/helpcenter\/docs\/universal-dde\/","title":{"rendered":"Universal DDE"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>DDE<\/strong> (Dynamic Data Exchange) is an <strong>old Windows protocol<\/strong> used in the past for exchanging data between applications. Nowadays it is <strong>obsolete<\/strong>. However, several trading platforms (especially those that have been on the market for a long time like <em>Metatrader<\/em>) use this protocol to send Real-Time (and ONLY real-time) data to other applications. <strong><em>DDE cannot be used to receive historical data.<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-background wp-block-paragraph\" style=\"background-color:#fff36b\"><strong>Data transmitted via DDE is very approximate and unsuitable for any professional analysis.<\/strong> Unless you have special needs, <strong>DO NOT<\/strong> connect Overcharts to other applications via DDE.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>General Information<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DDE protocol uses particular connection strings (in the format <strong>=SERVER|TOPIC!ITEM<\/strong>) which uniquely identify data to be received from external application. In trading platforms, data to be received are generally: <em>date<\/em>, <em>time<\/em>, <em>last<\/em>, <em>bid<\/em>, <em>ask<\/em> and related <em>sizes<\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The connection string of each single data has the format <strong>=SERVER|TOPIC!ITEM<\/strong> where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>SERVER<\/em><\/strong> indicates DDE service name to connect to<\/li>\n\n\n\n<li><strong><em>TOPIC<\/em><\/strong> and <strong><em>ITEM<\/em><\/strong> define data to be received.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example<\/strong>:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the Metatrader 4 platform, BID price connection-string of EURUSD (euro\/dollar instrument) is: <strong>=MT4|BID!EURUSD<\/strong> where MT4 represents the Server, BID the Topic, and EURUSD the Item.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As you can see, instrument symbol (EURUSD) is included in the connection string. In this case, in the DDE connection configuration in Overcharts, we will replace instrument symbol with string: <strong>$$$<\/strong>. This allows you to make the connection configuration general. The alternative (<em>do not even consider it!<\/em>) is to configure a DDE connection for each individual instrument.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In our example, BID price connection-string will be: <strong>=MT4|BID!$$$<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>The preconfigured connection to Metatrader 4 is already present in Overcharts.<\/em><\/p>\n\n\n\n<p class=\"has-background wp-block-paragraph\" style=\"background-color:#fff36b\">In general, connection string components are different from application to application. <strong>Refer to documentation of application you want to connect or ask their support directly). We do not know other applications in detail and cannot help you with that.<\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Connection Configuration<\/strong><\/h2>\n\n\n\n<p class=\"has-background wp-block-paragraph\" style=\"background-color:#cce9f5\">Before continuing, if you are new to the DDE protocol, we recommend that you search for some detailed information on the Internet.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">To connect Overcharts to an external application via DDE, follow these steps:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1<\/strong>. Make sure external application uses the DDE protocol to export real-time data. If the service is supported, you usually need to activate it. Refer to documentation of application you want to connect or <strong><em>ask their support directly<\/em><\/strong>). <em>We do not know other applications in detail and cannot help you with that.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2<\/strong>. If DDE protocol is supported, <strong>create<\/strong> a new <em>Universal DDE<\/em> connection from &#8216;<strong>Connections<\/strong>&#8216; tab of the Overcharts main window.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3<\/strong>. Set following properties:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>DATE &amp; TIME<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Date<\/strong>: (<em>optional<\/em>) set this property with its connection string ONLY if the DDE service you are connecting provides current date and ONLY if the <em>date<\/em> is provided separately from the <em>time<\/em>. Then select the right <em>date<\/em> <strong><a href=\"#2-toc-title\">format<\/a><\/strong> from those available. If you do not find the right <strong><a href=\"#2-toc-title\">format<\/a><\/strong> among those available, select OTHER and manually define the relative <strong><a href=\"#2-toc-title\">formatting string<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Time<\/strong> (<em>optional<\/em>): set this property with its connection string ONLY if the DDE service you are connecting provides current time and ONLY if the <em>time<\/em> is provided separately from the <em>date<\/em>. Then select the right <em>time<\/em> <strong><a href=\"#2-toc-title\">format<\/a><\/strong> from those available. If you do not find the right <strong><a href=\"#2-toc-title\">format<\/a><\/strong> among those available, select OTHER and manually define the relative <strong><a href=\"#2-toc-title\">formatting string<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Date\/Time (in the same field)<\/strong>: (<em>optional<\/em>) set this property with its connection string ONLY if the DDE service you are connecting provides current <em>date\/time<\/em> in a single field (<em>in this case, the previous Date and Time properties should NOT be set<\/em>). Then select the right <em>date\/time<\/em> <strong><a href=\"#2-toc-title\">format<\/a><\/strong> from those available. If you do not find the right <strong><a href=\"#2-toc-title\">format<\/a><\/strong> among those available, select OTHER and manually define the relative <strong><a href=\"#2-toc-title\">formatting string<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>If date\/time is NOT provided by DDE service, do not set the above properties. Current date\/time will be PC date\/time.<\/em><\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>TRADE<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Last (price)<\/strong>: define the LAST price connection-string. If DDE service you are connecting does NOT provide this data, then set this property with Bid or Ask price connection-string.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Last Size (volume)<\/strong>: (<em>optional<\/em>) define the last-filled-quantity connection-string. If DDE service you are connecting does NOT provide this information, leave it blank.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>BID<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bid<\/strong>: (<em>optional<\/em>) define the current BID-price connection-string. If DDE service you are connecting does NOT provide this information, leave it blank.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bid Size (volume)<\/strong>: (<em>optional<\/em>) define the BID-size connection-string. If DDE service you are connecting does NOT provide this information, leave it blank.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>ASK<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ask<\/strong>: (<em>optional<\/em>) define the current ASK-price connection-string. If DDE service you are connecting does NOT provide this information, leave it blank.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ask Size (volume)<\/strong>: (<em>optional<\/em>) define the ASK-size connection-string. If DDE service you are connecting does NOT provide this information, leave it blank.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>FORMAT<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Decimal Separator<\/strong>: define the character used as decimal separator (usually \u2018.\u2019)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thousands Separator<\/strong>: define the character used as thousands separator (it is usually not used &gt; in this case leave it blank)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Price Multiplier<\/strong>: necessary only if prices are expressed without decimal separator (e.g. 1055 actually represents 10.55)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Volume Multiplier<\/strong>: necessary only if volumes are expressed without decimal separator (e.g. 1055 actually represents 10.55)<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>INSTRUMENT<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Simulation Account (default)<\/strong>: select the default simulation-account for the connection.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>QUOTES ADJUSTMENT<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Data Time Zone<\/strong>: define time zone ONLY if it is unique for all instruments (therefore also if date\/time is NOT provided via DDE, but is PC date), otherwise leave the default setting: &#8216;<strong><em>as specified in Exchange\/Instrument configuration<\/em><\/strong>&#8216;. You will then need to define the right time zone in the exchange\/instrument configuration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Decimal Part expressed as&#8230;<\/strong>: define the format of price decimal part (default: decimal).<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4<\/strong>. Complete any other required fields.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>5<\/strong>. Save.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>6<\/strong>. Start the connection from <strong>Connections<\/strong> Tab by pressing <strong>CONNECT<\/strong> button or by <em>double-clicking on the connection<\/em>. If a <em>red<\/em> dot appears in the Real-Time column next to the connection, it means that connection settings are not correct. Hover over \u201c<strong>i<\/strong>\u201d icon (<em>next to the red dot<\/em>) to read a more detailed error message.<\/p>\n\n\n\n<p class=\"has-background wp-block-paragraph\" style=\"background-color:#fff36b\">Unfortunately, a DDE connection can appear as connected (<em>green<\/em> dot) even when it actually is not. A green dot is NOT sufficient to indicate whether or not you are connected to DDE service. It is always necessary to verify you are receiving real-time data by opening a chart. <strong><em>Also remember to start the DDE application and\/or service.<\/em><\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Date\/Time Formats<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For date\/time properties it is also necessary to define date\/time format by selecting right format among predefined ones. If desired formatting is not present, choose <strong><em>Other<\/em><\/strong> item and define the formatting according to these rules:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>Date characters<\/em><\/strong>:  <strong>y<\/strong> = year; <strong>m<\/strong> = month; <strong>d<\/strong> = day<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>Time characters<\/em><\/strong>:  <strong>h<\/strong> = hour; <strong>m<\/strong> = minute; <strong>s<\/strong> = second; <strong>f<\/strong> = millisecond; <strong>c<\/strong> = microsecond; <strong>@pm<\/strong> = post meridiem (to use only if the time is expressed in 12 hours)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Wildcard character<\/strong>: if any date\/time part is of variable length, insert a wildcard * (asterisk) before character representing the year, month, day, hour, minute, etc. If it is of fixed length, repeat the character as many times as the part is long. For example, if the year is always expressed as 4 digits, correct format for the year is: <em>yyyy<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Separators<\/strong>: Space &#8211; \/ . : etc.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Formatting samples:<\/em><\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><tbody><tr><td>20220614<\/td><td>yyyymmdd<\/td><\/tr><tr><td>06 Feb 22<\/td><td>dd mmm yy<\/td><\/tr><tr><td>2022-1-27<\/td><td>yyyy-*m-dd<\/td><\/tr><tr><td>22-01-27<\/td><td>*y-*m-*d<\/td><\/tr><tr><td>17:25:13.000<\/td><td>hh:mm:ss.fff<\/td><\/tr><tr><td>17:25:13.000<\/td><td>*h:*m:*s.*f<\/td><\/tr><tr><td>5:25:13pm<\/td><td>*h:mm:ss@pm<\/td><\/tr><tr><td>16-02-2014 14:30:13.332<\/td><td>dd-mm-yyyy hh:mm:ss.fff<\/td><\/tr><tr><td>16-02-2014 14:30:13.332.547<\/td><td>dd-mm-yyyy hh:mm:ss.fff.ccc<\/td><\/tr><tr><td>11:30<\/td><td>hh:mm<\/td><\/tr><tr><td>11:30:23<\/td><td>hh:mm:ss<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>DDE (Dynamic Data Exchange) is an old Windows protocol used in the past for exchanging data between applications. Nowadays it is obsolete. However, several trading platforms (especially those that have been on the market for a long time like Metatrader) use this protocol to send Real-Time (and ONLY real-time) data to other applications. DDE cannot [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[3],"doc_tag":[],"class_list":["post-2565","docs","type-docs","status-publish","hentry","doc_category-connections"],"year_month":"2026-10","word_count":1214,"total_views":"3","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"Overcharts Team","author_nicename":"overadmin","author_url":"https:\/\/www.overcharts.com\/en\/helpcenter\/author\/overadmin\/"},"doc_category_info":[{"term_name":"Connections","term_url":"https:\/\/www.overcharts.com\/en\/helpcenter\/docs-category\/connections\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Universal DDE - Overcharts Help Center<\/title>\r\n<meta name=\"description\" content=\"DDE (Dynamic Data Exchange) is an old Windows protocol used in the past for exchanging data between applications.\" \/>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.overcharts.com\/en\/helpcenter\/docs\/universal-dde\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Universal DDE - Overcharts Help Center\" \/>\r\n<meta property=\"og:description\" content=\"DDE (Dynamic Data Exchange) is an old Windows protocol used in the past for exchanging data between applications.\" \/>\r\n<meta property=\"og:url\" content=\"https:\/\/www.overcharts.com\/en\/helpcenter\/docs\/universal-dde\/\" \/>\r\n<meta property=\"og:site_name\" content=\"Overcharts Help Center\" \/>\r\n<meta property=\"article:modified_time\" content=\"2025-01-31T11:29:02+00:00\" \/>\r\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\r\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6 minutes\" \/>\r\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/docs\\\/universal-dde\\\/\",\"url\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/docs\\\/universal-dde\\\/\",\"name\":\"Universal DDE - Overcharts Help Center\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/#website\"},\"datePublished\":\"2023-04-01T07:02:55+00:00\",\"dateModified\":\"2025-01-31T11:29:02+00:00\",\"description\":\"DDE (Dynamic Data Exchange) is an old Windows protocol used in the past for exchanging data between applications.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/docs\\\/universal-dde\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/docs\\\/universal-dde\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/docs\\\/universal-dde\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Universal DDE\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/#website\",\"url\":\"https:\\\/\\\/www.overcharts.com\\\/en\\\/helpcenter\\\/\",\"name\":\"Overcharts Help Center\",\"description\":\"Trading Software &amp; 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