EH> What I was wondering is the following: When writing a 
 EH> dll that might be used for multiple threads, I want to

I assume you mean different threads from the same process,  since one
thread from each of many processes is easy to cleanup after (the system
does it for you if your dll is "INITINSTANCE/TERMINSTANCE".


 EH> have different variables (possibly with the same name, 
 EH> as they are passed in strings) for different threads. 
 EH> Is there a way to detect a thread has stopped and 
 EH> should disallocate the memory?

Install an exception handler (see DosSetExceptionHandler) and look for the
XCPT_PROCESS_TERMINATE and XCPT_ASYNC_PROCESS_TERMINATE exceptions (these
are called when a thread dies,  not the whole process as the name might
imply).


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