FT>
  > Is a DLL originally compiled for windows usable with an os/2 EXE ?
FT>

  No.

  Although Windows DLLs use the "New Executable" format, the same as
  16-bit OS/2 DLLs, they cannot be used by 16-bit OS/2 applications, both
  because the program loader prevents this, and because there are
  significant architectural differences between DOS+Windows and 16-bit
  OS/2.

  DLLs in DOS+Windows have one data segment, shared across all "tasks"
  using that DLL.  Whereas in 16-bit OS/2 DLLs usually have a separate
  copy of the data segment for each process using the DLL.

  DLLs in DOS+Windows are initialised only once, when the DLL is first
  loaded.  Whereas in 16-bit OS/2 DLLs are usually initialised each
  time that a new process starts using the DLL.

  DOS+Windows program have to issue INT 21H instructions in order to call
  low-level system services (such as opening a file).  Whereas in 16-bit
  OS/2 executing an INT 21H instruction will cause OS/2 to issue an
  exception, which will usually terminate the process there and then.

  16:16 huge pointer arithmetic works differently in DOS+Windows to how it
  works in 16-bit OS/2.  Many C++ run-time support libraries will be
  completely stymied.

  Solution #1 : Obtain the world-famous c't patch kit for Borland Pascal
                7.0, and compile your DLL as a 16-bit OS/2 DLL.

  Solution #2 : Buy a native OS/2 Pascal compiler, such as Speed Pascal
                or Virtual Pascal, and use it to recompile the code as a
                proper 32-bit OS/2 DLL.

  > JdeBP <
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