INT 13 - FAST! - API
AH = 80h
CX = 6572h
DX = 1970h
ES:BX -> data structure (see below)
AL = function
01h ???
04h ???
05h ???
06h installation check
Return: AX = 1965h if installed
07h ???
09h ???
0Ah ???
0Bh ???
0Ch set ??? flag
0Dh clear ??? flag
Return: AH = 00h if successful (except function 06h)

Format of data structure:
Offset  Size    Description
00h    DWORD   pointer to 19-byte signature string
13h 07h 06h 08h 11h 18h 0Fh 0Eh 02h 18h 13h 08h 0Bh 08h 01h 00h
04h 08h 15h  (v4.04)
04h    ???     ???


1380 - FAST! - API