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Values keyboard filter function is called with when keyboard is in field mode

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