Int 16 Fn 55FF  - Swap Utilities - ???                                     [U]

   AX = 55FFh
   BX >= 0004h
   CX = function
       0000h set ??? flag
       other clear ??? flag

Note:  present in SWAPSH and SWAPDT v1.77j, distributed with PC Tools v7, as
     well as the Trusted Access SCRNBLNK.COM; this may be part of the
     standard TesSeRact library

See Also: INT 2F/AX=5453h