INT 50 - PCIBM PC Thuis Organizer Shell - TRACE MENU
	AX = 0010h
	ES:BX -> first menu structure
	CL = hotkey to look up
Return: AL = index 1 or FFh if not selected
	AH = index 2 or FFh if not selected
	BL = index 3 or FFh if not selected
	BH = index 4 or FFh if not selected
Index:	hotkeys;PCIBM PC Thuis Organizer Shell