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Force SSH Client To Use Given Private Key ( identity file )

Recently, my desktop hard disk crashed. So I reinstalled Linux and created a new set of private RSA keys for authentication. However, two of my remote UNIX servers still uses old DSA keys. I do not remember root password for those servers. I do have backup of private and public DSA keys and currently stored in /backup/home/user/.ssh/id_dsa and /backup/home/user/.ssh/id_dsa.pub. How do I force my ssh clients to use identity file /backup/home/user/.ssh/id_dsa to get back to my remote UNIX servers?
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Run SSH In The background After Running a GUI Linux Application

How can I run ssh (or gui over ssh) in the background after running a Linux or Unix GUI application? How do I run any UNIX x11 application in background with SSH Linux client?
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