INT 16 - PC Tools v5.1+ DESKTOP API - GET SCREEN ATTRIBUTE ARRAY
AX = FFF5h
Return: ES:BX -> screen attributes data structure (see below)
AL = ??? (v6.0+)

Format of attribute data structure:
Offset  Size    Description
-1     BYTE    attribute for desktop background
00h    BYTE    attribute for normal characters on desktop menu
01h    BYTE    attribute for highlighted characters on desktop menu
02h  5 BYTEs   ???
07h    BYTE    attribute for dialog boxes
08h 15 BYTEs   ???
17h    BYTE    attribute for message boxes


16FFF5 - PC Tools v5.1+ DESKTOP API - GET SCREEN ATTRIBUTE ARRAY