Int 2F Fn B800  - 10net - Installation Check                               [N]

   AX = B800h
   CX = F041h

Return: AL = status
       00h     not installed
       nonzero installed
       BX = installed component flags (test in this order!)
          bit 6   server
          bit 2   messenger
          bit 7   receiver
          bit 3   redirector
          bit 1   LANPUP (LANtastic 4.0)
       CX = 10Net data segment
       CX:DX -> 10Net Configuration Table (see AX=5E01h"10NET")

Note:  if CX <> F041h on entry, neither CX nor DX will be changed, and this
     call becomes identical to the standard installation check above

See Also: AX=B800h"network",INT 21/AX=5E01h"10NET"