Thread local memory is a 128-byte region of thread-specific memory that OS/2 assigns to a thread when the thread is created. Thread local memory for each thread is always at the same virtual address, but each thread's local memory region is backed by different physical memory, so the memory is specific to each thread. This memory region is divided into 32 DWORDS (4 bytes per DWORD), and is normally used to store a small number of pointers.
A thread can allocate thread local memory by calling DosAllocThreadLocalMemory. Thread local memory is freed by calling DosFreeThreadLocalMemory.
Note that thread local memory should be used sparingly. You should not use the entire 128 byte region.