Int 21 Fn 251A  P - Phar Lap 386/dos-extender Vmm - Lock Pages In Memory   [E]

   AX = 251Ah
   EDX = number of 4k pages to lock
   if BL = 00h
       ECX = linear address of first page to lock
   if BL = 01h
       ES:ECX -> pointer to first page to lock

Return: CF clear if successful
   CF set on error
       EAX = error code
       08h insufficient memory
       09h invalid address range

See Also: AX=251Bh,AX=EB06h,INT 31/AX=0600h