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 What is DDE ?
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 Dynamic data exchange (DDE) is a form of interprocess communication that
 uses shared memory to exchange data between applications. Applications can
 use DDE for one-time data transfers and for ongoing exchanges in which the
 applications send updates to one another as new data becomes available.

 Dynamic data exchange differs from the clipboard data-transfer mechanism
 that is also part of the Windows operating system. One difference is that
 the clipboard is almost always used as a one-time response to a specific
 action by the user--such as choosing the Paste command from a menu. Although
 DDE may also be initiated by a user, it typically continues without the
 user's further involvement.

 FiveWin implements two Classes TDDEMLServer and TDDEMLClient to easily
 manage a DDE Client-Server session.