Int 2A Fn 0500  - Network - Get Network Resource Availability              [N]

   AX = 0500h

Return: AX reserved
   BX = number of network names available
   CX = number of network control blocks available
   DX = number of network sessions available

Notes: supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET,
     etc.
   the application should call this function before using any network
     resources, and maintain its own count to avoid exceeding the
     network's resource limits

See Also: AH=00h,AH=01h,AH=04h,INT 5C"NetBIOS"