Int 61 Fn 0004  - Banyan Vines - Set Drive Connection                      [N]

   AX = 0004h subfn 0001h
   DS:DX -> request block (see #3073)

Return: AX = status (0000h,0037h,0038h,0055h) (see #3071)
Desc:  Maps the specified file service to a DOS drive letter

Note:  If an empty service name is specified, an existing connection will
     be removed

See Also: AX=0004h/SF=0002h

Format of VINES Function 0004h/Subfunction 0001h request block:
Offset Size    Description (Table 3073)
 00h   WORD    0001h
 02h   BYTE    drive number (0=default, 1=A, ...)
 03h 16    BYTEs   reserved
 13h 64    BYTEs   null-terminated file service name
 53h  5    BYTEs   reserved