Forking an .rb script (or multi-threading)

Hi,

I am using rubyscript2exe on my rails app. tar2ubyscript uses an init.rb
file to launch WEBrick.

I want to modify this init.rb file to launch the browser (to
127.0.0.1:300) as soon as WEBrick has started.

Is there a way to monitor the progress of the output/state of the
script/server.rb command, to launch my browser once it has successfuly
started the server?

Don’t know whether this would be possible, or which libraries to look at
… Any ideas would be a huge help.

Thanks
Joerg