Int 21 Fn 5FB2  - Lantastic V3+ - Get Username From Account File           [N]

   AX = 5FB2h
   BX = username entry index (0 for first)
   DS:SI -> 16-byte buffer for username
   ES:DI -> ASCIZ server name in form "\\machine"

Return: CF clear if successful
   CF set on error
       AX = error code
   BX = next queue entry index

See Also: AX=5FB0h