INT 21 - Novell NetWare - WORKSTATION - GET DRIVE HANDLE TABLE                  
	AX = EF00h
Return: ES:SI -> network shell's 32-byte drive handle table
	AX = 0000h
Notes:	this function is supported by Advanced NetWare 1.0+
	each byte in the drive handle table contains the directory handle for
	  the corresponding drive, or 00h if not mapped to a directory
SeeAlso: AX=EF01h,AX=EF02h,AX=EF03h,AX=EF04h