INT 6F - 10NET v5.0 - "WHO" - ENUMERATE USERS ON NETWORK
	AH = 8Dh
	BX = service mask (see #03779)
	CX = length of buffer
	DS:DX -> buffer for array of Who data structures (see #03780)
Return: CF clear if successful
	    CX = number of nodes matching service mask
	    DS:DX buffer filled
	CF set on error
	    AX = status (see #03740)
SeeAlso: AH=0Dh


Bitfields for 10NET service mask:
Bit(s)	Description	(Table 03779)
 0	workstation
 1	file server
 2	print server
 3	de-spool server


Format of 10NET Who data structure:
Offset	Size	Description	(Table 03780)
 00h  8 BYTEs	user name
 08h 15 BYTEs	node ID
 17h  3 BYTEs	unique portion of Ethernet address
 1Ah	BYTE	Who group number
 1Bh	WORD	service mask (see #03779)
 1Dh	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	serial number
 21h	BYTE	maximum concurrent users with same serial number allowed on net
 22h	BYTE	chat mask (see #03781)
 23h	BYTE	internal system bits (see #03782)
 24h  9 BYTEs	version number in format MM.mm.xxx
 2Dh	BYTE	number of shared directories
 2Eh	BYTE	number of shared printer queues


Bitfields for 10NET chat mask:
Bit(s)	Description	(Table 03781)
 0	chat permitted
 1	bell enabled
 2	chat keyboard initiated
 3	in INT 16 handler
 4	in Get Input
 5	display has timed out
 6	chat is idle


Bitfields for 10NET internal system bits:
Bit(s)	Description	(Table 03782)
 0	submit permitted
 1	submit initiated
 2	submit executing
 3	internal client call/chat/spool/autospool
 4	in spool termination
 5	print permitted
 6	waiting for keyboard input