Rails - Apr 2009 - can i update rails to the latest version using Instant Rails

If using Instant Rails, is it possible to update everything to the
latest version by bringing up a Ruby Console from Instant Rails and do a

gem install rails

?

also, Install Rails kept on complaining that an app is already running
at the specified port... turns out I just need to turn off Vista''s
firewall for apache to run.  thanks.
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