Windows Home does not have support for joining a Domain.
However a Wireless network password is completely different thing than a Domain network user and password combo.
One is used to connect to the Wireless network, and the other is used to Join the actual computer based domain that may or may not be wireless, or even part of the wireless network to which you wish to connect.
The wireless password would likely only give you access to the Internet, but not to any domain based resources such as server shared folders, or domain printers.
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Phil AKA Vacunita
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.