Int 21 Fn 5F48  u - LAN Manager Enhanced DOS - Local Netusedel             [N]

   AX = 5F48h
   BX = force level
       0000h no force
       0001h force
       0002h lots of force
   ES:DI -> buffer as either the local device name or UNC remote name

Return: CF clear on success
   CF set on error
       AX = error code

See Also: AX=5F46h,AX=5F48h,AX=5F49h