The Task State Segment (TSS) is a hardware architected control block that is used for two purposes:

To implement the privileged level transition mechanism initiated with a Call Gate instruction.
To provide a register save area for hardware task switching initiated with a call to a Task Gate.

In general OS/2 does not use the hardware task switching mechanism, so TSSs are few. It does however use the TSS for implementing Application Programming Interfaces (APIs) in the system.

A TSS may be formatted using the Kernel Debugger and Dump Formatter DT command.

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