INT 62 u - FGDRIVER v4.02 - "FG_MOUSEINI" - INITIALIZE MOUSE SUPPORT
	AX = 0077h
Return: AX = status
	    0002h two-button mouse
	    0003h three-button mouse
	    FFFFh initialization failed
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	After this call, the mouse cursor is invisible
SeeAlso: AX=0076h,AX=0078h,AX=007Ch