INT 50 - Vanderaart TEXT WINDOWS - EDIT LINE IN WINDOW

	AX = 0006h
	ES:BX -> text string
	CH = type of input (see #03242)
	DH,DL = row,column of upper left corner
	DI = window handle
Return: AX = key which terminated entry
	    0000h Enter
	    0001h Esc
	    0002h Down arrow
	    0003h Up arrow
	    0004h F10