When logged on as Administrator go into My Computer properties > Computer Name > Network id and follow the wizard for each profile i.e. a corporate network and a home network.
You'll have to be connected to the network you are joining when doing this.
For the Corporate network you'll need your netlogon username and password, domain name, network Administrator username and password(the wizard prompts for this when it needs to authenticate joining to the network).
The home network should be easier. Never done one but I expect you'll need only a username, password and localhost domain name.
When you logon to windows with either username the logon dialogue box will have a dropdown box when you select 'Options' where you can select the domain you are joining.
Hmmm. Hope that makes sense. If I had the machine here I could do it in a couple of minutes. I'm not very good at explaining things long distance