The Thread Slot Number is a system wide unique identifier assigned to each thread in the system.

Threads are located from the thread slot table whose linear address is at global symbol:

_papTCBSlots

Each slot is a double-word linear address of the corresponding thread's TCB. The first slot (slot=0) is reserved.

Under the Kernel Debugger and Dump Formatter the following symbols may be used to represent particular threads in many of the commands that accept a slot number as a parameter: