If you need different SSH parameters for different hosts, you can do so by using a feature of the PuTTY suite called sessions.
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Download the PuTTY suite from the PuTTY site.
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Run putty.exe and enter the required parameters, then enter an appropriate session name below the Saved Sessions label, and click Save.
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In the TortoiseCVS Checkout Dialog, enter the session name instead of the host name.