INT 21 - TopWare Network OS v5.10+ - GET LOGON USER INFORMATION                 
	AX = FFBFh
	DX:BX -> buffer for logon information (see #02535)
Return: AL = status (00h successful, else failed)
	AH = number of logged-in stations


Format of TopWare logon information:
Offset	Size	Description	(Table 02535)
 00h	BYTE	station address
 01h 15 BYTEs	username