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The nature of the Topic depends on the server. For Word, a 'topic' may be a document name; for Excel, it may be a name of a spreadsheet. There is also a special topic called 'System', which is supplied by most applications that support DDE.
The 'System' topic is used when there are several topics available - for example, when you are accessing data from multiple spreadsheets. The 'System' topic is also used to perform certain tasks at the application level.
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