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