Int 2C Fn 0021  P - Cloaking - Save Protected-mode State                   [m]

   AX = 0021h
   ES:EDI -> buffer for protected-mode state

Return: CF clear
   buffer filled

Note:  this function was first introduced with RM386 (RAM-MAN/386) v6.00

See Also: AX=0020h,AX=0022h