INT 15 - TopView - "BEGINC" - BEGIN CRITICAL REGION
AX = 101Bh
Return: task-switching temporarily disabled
Notes:  will not task-switch until "ENDC" (AX = 101Ch) called unless task
voluntarily releases the CPU (upon regaining the CPU, task-switching
will again be disabled)
suspends the caller until DOS is free
SeeAlso: AX=101Ch,AX=DE13h,AX=DE1Ch,INT 2F/AX=1681h

See also: 150D

15101B - TopView - "BEGINC" - BEGIN CRITICAL REGION