Function            isNetwork - is a network installed

  Syntax              boolean isNetwork(void);

  Prototype in        network.h

  Remarks             checks if a network is installed.

  Return value        returns TRUE if a network is installed, FALSE
                      otherwise.

  Note                this function requires DOS 3.1+

  Example             #include <network.h>

                      main()
                      {
                           printf("A network is ");
                           if (! isNetwork())
                                printf("not ");
                           printf("installed\n");
                      }