INT 2F - Windows95 - SET/CLEAR "REPORT WINDOWS TO DOS PROGRAMS" FLAG

	AX = 1231h
	DL = function
	    00h set byte after "IsWIN386" to 01h
	    01h set "IsWIN386" bit 1
	    02h clear "IsWIN386" bit 1
	    else
		Return:	CF set
			AX = 0001h
Return: CF clear
	AX = 0000h
Note:	this function is not supported by DR-DOS 7.03 or earlier, by S/DOS 1.0,
	  or by PTS-DOS 6.51
BUG:	Windows98 will crash the system if DL>02h on entry due to an off-by-1
	  conditional jump; if the jump were correct, the function would return
	  CF set/AX=0001h as for Windows95
SeeAlso: AX=1230h,AX=1200h