Windows TEB

For a multi-thread applications, each thread must has its own stack. The stack address and size are stored inTEB. In a 33 bits system, the FS segment register pointed to the TEB and in a 64 bit system, GS segment register is used 

The ExceptionList field points to the SEH, structure exception handling, chain set up in the program to try and catch exceptions. This not applicable to 32 bit system.