Int 31 Fn 0101  P - Dpmi 0.9+ - Free Dos Memory Block                      [E]

   AX = 0101h
   DX = selector of block

Return: CF set if successful
   CF set on error
       AX = DOS error code (07h,09h) (see #1366 at INT 21/AH=59h/BX=0000h)

Notes: all descriptors allocated for the block are automatically freed
   DPMI 1.0+ automatically zeros any segment registers containing a
     selector freed by this function
   not supported by MS Windows 3.0 in Standard mode

See Also: AX=0100h,AX=0102h,AX=0502h