INT 21 - OS/286, OS/386 - ISSUE REAL PROCEDURE CALL                             
	AH = E1h
	???
Return: ???
Note:	protected mode only???
SeeAlso: AH=E0h"OS/286",AH=E2h"OS/286",AH=E3h"OS/286",AX=250Eh,INT 31/AX=0301h