INT 21 - Novell NetWare - GET NETWORK SERIAL NUMBER                             
	AH = E3h subfn 12h
	AL = 00h
	BX = CX = DX = 0000h
	DS:SI -> request buffer (see #01909)
	ES:DI -> reply buffer (see #01910)
Return: AL = status
	    00h successful
Desc:	return the serial number and application number for the software
	  installed on the file server
Notes:	this function is supported by Advanced NetWare 2.1+
	reportedly, the workstation crashes if AL,BX,CX, and DX are not all
	  zero
SeeAlso: AH=E3h/SF=0Ch,AH=E3h/SF=11h,AX=F217h/SF=12h


Format of NetWare "Get Serial Number" request buffer:
offset	 size	description	(Table 01909)
 00h	 WORD	0001h (length of following data)
 02h	 BYTE	12h (subfunction "Get Serial Number")
SeeAlso: #01910,#02167


Format of NetWare "Get Serial Number" reply buffer:
offset	 size	description	(Table 01910)
 00h	 WORD	(call) 0006h (size of following results buffer)
 02h   4 BYTEs	(big-endian) NetWare server serial number
 06h   2 BYTEs	(big-endian) NetWare application serial number
SeeAlso: #01909,#02167