INT 61 - Banyan VINES - TEST DRIVE CONNECTION                                   
	AX = 0004h subfn 0006h
	DS:DX -> request block (see #03407)
Return: AX = status (see also #03400)
	    0000h connection flag returned in request block
Desc:	Returns a flag indicating if the drive is connected to a file service
SeeAlso: AX=0004h/SF=0007h


Format of VINES Function 0004h/Subfunction 0006h request block:
Offset	Size	Description	(Table 03407)
 00h	WORD	0006h (subfunction "Test Drive Connection")
 02h	BYTE	buffer for connection flag (1 = not connected, 2 = connected)