Currently Being ModeratedApr 3, 2013 11:13 AM (in response to strabo)
Yes, assuming that your iMac has a wireless card installed and it is operating correctly....and the iMac is located where it can receive a strong wireless signal from the AirPort router.
Might be a good idea to test that iMac out first.
Currently Being ModeratedApr 4, 2013 8:14 PM (in response to strabo)
Depending on the model of your iMac, you would either need to install an AirPort Extreme card inside it or use a wireless USB adapter. This would allow your iMac to join existing wireless networks.