INT 92 - Da Vinci eMail Dispatcher - "NetWhereIs"
	AX = E104h
	BX = size of parameter block in words (0006h)
	CX:DX -> parameter block (see #03981)
Return: AX = status (see #03979)
Desc:	this function is used to verify node address for usernames
SeeAlso: AX=E180h


Format of Da Vinci eMail "NetWhereIs" parameter block:
Offset	Size	Description	(Table 03981)
 00h	WORD	segment of node address buffer
 02h	WORD	offset of node address buffer
 04h	WORD	segment of uppercase username
 06h	WORD	offset of uppercase username
 08h	WORD	segment of "DVSEMAIL"
 0Ah	WORD	offset of "DVSEMAIL"