INT 15 - MultiDOS Plus - DISABLE MULTITASKING                                   
	AH = 0Dh
Return: nothing
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=0Eh"MultiDOS",AH=10h"MultiDOS",AX=101Bh,AH=20h"MultiDOS"