a) Requests to increase
the size of an existing DOS memory block may fail due to subsequent DOS
memory block allocations causing fragmentation of DOS memory, or insufficient
remaining DOS memory.
b) Under DOS/32 Advanced
and DPMI 1.0 hosts, any segment registers which contain a selector being
modified are reloaded by this function.
c) Client programs should
never modify or free any descriptors allocated by this function. The Free
DOS Memory Block DPMI function 0101h will deallocate the descriptors automatically.