Int 15 Fn DE1C  - Desqview V2.23+ - "enterc" - Increment Critical Nesting  [Q]

   AX = DE1Ch

Return: nothing

Notes: similar to AX=101Bh, but begins the critical region without ensuring
     that DOS is free
   the official documentation states that this call should be paired with
     "ENDC" (AX=101Ch); no mention is made of AX=DE1Bh
   this API call may be made from within a hardware interrupt handler

See Also: AX=101Bh,AX=101Ch,AX=DE13h,AX=DE1Bh