How can I check from a VxD that Win16Mutex is acquired? And I also remember
that there was some kind of Win32Mutex that has the same effect (prevents
the driver from calling into Ring3). Can anybody confirm or decline that?
In other words: how can I get to Thread Information Block (TIB) or Thread
Database (TDB) structure from VxD? I know that it’s possible (because
SoftIce displays that information). This is really a stopper for me so I
would highly appreciate any hints on this matter!

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