DDEML Application-Instance IDs Are Thread Local

 Last reviewed: November 2, 1995
Article ID: Q94091
The information in this article applies to:
  • Microsoft Win32 Application Programming Interface (API) included with: 

        - Microsoft Windows NT versions 3.1 and 3.5

When using the DDEML (Dynamic Data Exchange Management Library) libraries from a spawned thread, the application-instance ID that is returned in the lpidInst parameter of DdeInitialize is thread local.

Therefore, the application-instance ID cannot be used by any other thread that is spawned by the process, nor can it be inherited from the parent.

To use the DDEML libraries within a thread, it is necessary to make both the DdeInitialize call and to use the DdeUninitialize call from within the thread; otherwise, there is no way to terminate the DDEML session.

Additional reference words: 3.10 3.50
KBCategory: kbui
KBSubcategory: UsrDde

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Last reviewed: November 2, 1995
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