Connecting and refreshing a wireless network without restart

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http://askubuntu.com – After I set up my wireless network, I had to restart my computer before it would connect. I have talked to/read comments by, several other Ubuntu users who had to do the same thing. Why does this happen, and is there a way to connect a wireless network without a restart? Are we all just noobs and missing something obvious? I already understand the driver install process, but I just don't see why A restart seems to be necessary so often. (HowTos)