I've tried to set up a network of 2 computers using advice below (in firewall question.)  Both access internet, and one will show both computers in its workgroup (although I can not actually access both computers).  The other computer gives the following message when I try to view workgroup computers :  "(workgroup) is not accessible.  You might not have permission to use this network resource.  Contact the administrator of this server to find out if you have access permissions.  The list of servers for this workgroup is not currently available."   Any suggestions?