Int 16 Fn FFC5  U - Pc Tools V5.1-8.0 Desktop - Check Whether Desktop Loa  [U]

   AX = FFC5h

Return: BL = Desktop state
       00h if nonresident
       nonzero if loaded resident

Note:  available only when popped up; should call AX=FFEFh first to ensure
     that DESKTOP is active

See Also: AX=FFEFh,AX=FFF3h