INT 21 - LANtastic - LOGIN TO SERVER
AX = 5F81h
ES:DI -> ASCIZ login path followed immediately by ASCIZ password
BL = adapter number
FFh try all valid adapters
00h-07h try only specified adapter
Return: CF clear if successful
CF set on error
AX = error code
Notes:  login path is of form "\\machine\username"
if no password is used, the string at ES:DI must be terminated with
three NULs for compatibility with LANtastic v3.0.
SeeAlso: AX=5F84h

See also: 215F82

215F81 - LANtastic - LOGIN TO SERVER