Can't connect on an SQL Server 2012 named instance on a second computer on the network

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http://serverfault.com – Both computer have Windows 7 but i can't connect from one computer to the other where SQL Server 2012 Express is installed. EDIT: This is a local network. Ive opened up the program on the firewall and enable sql browser service but i still can't connect. I used the format "HOSTNAME\NAMEDINSTANCE". Thanks, any help is greatly appreciated. (HowTos)