Int 15/AH=12h/BH=14h

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TopView - SEND MESSAGE - SETESC - SET ESCAPE ROUTINE ADDRESS

AH = 12h
BH = 14h
BL = message modifier
00h handle is DWORD on top of stack
01h define user stream
04h intercept keystrokes from KEYBOARD to window (handle on stack)
05h intercept keystrokes from task's default KEYBOARD to a window.

STACK:
(if window) DWORD user stream number (14h-1Fh) DWORD address of FAR user stream handler (if keyboard) DWORD address of FAR filter function (see #00452)

Return:
STACK popped

(Table 00452) Values keyboard filter function is called with when keyboard is in field mode: AL = character AH = 00h or extended ASCII code if AL = 00h BL = field number CH = cursor column CL = cursor row DL = field type modifier (sixth item in field table entry) DH = seventh item in field table entry ES:SI = window's handle DS:DI -> field table entry for field containing the cursor

Return:
AH = action to take 00h use keystroke 01h ignore keystroke FFh beep and ignore keystroke

Note: The filter function is not allowed to make INT 15, DOS, or BIOS calls

Category: DESQview/TopView and Quarterdeck Programs - Int 15h - T

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