main thread of a process

[borota]

I want to send messages to the main thread of a Win process created with 
'spawn'. Is there a way to do that in 'pure Cygwin'? 

The Windows sequence would be:
CreateProcess(NULL, cmd, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
...
PostThreadMessage(pi.dwThreadId, WM_QUIT, 0, 0); //or whatever
... 

'spawn' returns the 'pid' of the new process. Is that always equal to 
pi.dwProcessId? Is there a way to get from this 'pid' to sending messages to 
the main thread? Is there a place where pi.dwThreadId is saved?
(global structure, etc.) 

Thanks,
Greg
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