INT 61 - Banyan VINES - SET USER NAME                                           
	AX = 0004h subfn 0004h
	DS:DX -> request block (see #03405)
Return: AX = status (0000h) (see #03400)
Notes:	Other side effects, if any, not known
SeeAlso: AX=0004h/SF=0005h,[ID 0004h]">#03431 [ID 0004h],AX=0007h/BX=0005h


Format of VINES Function 0004h/Subfunction 0004h request block:
Offset	Size	Description	(Table 03405)
 00h	WORD	0004h
 02h 64	BYTE	null-terminated user name