Hi Alexander,

>This is not clear for me too. DLL may be not thread-safe, but I don't think that two separate Win32 applications can affect each other.

Instances could affect each other if they depend on named objects, like a MUTEX or Semaphores. Not sure what exactly the problem with phdbase is, but even multiple EXE COM Server fail if the same phdbase FLL is loaded.

--
Christof