Int 15 Fn 0D  - Multidos Plus - Disable Multitasking                       [T]

   AH = 0Dh

Note:  calling task receives all time slices until AH=0Eh is called; this
     allows time-critical events or nonreentrant code to be processed

See Also: AH=0Eh"MultiDOS",AH=10h"MultiDOS",AX=101Bh,AH=20h"MultiDOS"