INT 15 - MultiDOS Plus - DISABLE MULTITASKING
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
SeeAlso: AH=10h"MultiDOS",AX=101Bh,AH=20h"MultiDOS"

See also: 150E

150D - MultiDOS Plus - DISABLE MULTITASKING