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XMSlock

Locks an extended memory block

Returns its base address as a 32-bit linear address.  Locked memory blocks are
guaranteed not to move, but should be unlocked as soon as possible.  A block
does NOT have to be locked in order to use the XMSCopy() function.

Header File.....TCXLmem.h

Prototype......._AdrT PAS XMSlock(_HdlT xh);

Arguments.......xh -  XMS Handle

Returns.........32-bit linear pointer to base of memory block.  0 if error.