The Thread Information Block (TIB) is
a supplemental thread related control block made accessible to ring 3 programs.
It contains thread information obtained from the thread's TCB
and acts as an anchor for exception-handlers registered for the thread.
The TIB may be located from TCBptib (TCB + 0x10) using
the Dump Formatter or Kernel Debugger.
A program gains access to the TIB along with the PIB
by calling the DosGetInfoBlocks API.
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