CMIS don't have web parts as such. You can link their ePortal through Sharepoint and use the sharepoint logon to access. I'm in the process of testing this.
Microsoft SharePoint Full Article Link - Virtual Learning Platforms: Sharepoint Learning Kit

Summary: We have a MOSS 2007 and are finding it very difficult to deal with the ... Is there a way to ensure that Windows will capture the logon the ... capture it at the first SharePoint logon? ...
Microsoft SharePoint Full Article Link - Authentication/logon

Summary: My company operates a Sharepoint site (not a Portal Server site) ... accessible by internet users. ... personalized login information, our login fails. ...
Microsoft SharePoint Full Article Link - Sharepoint logon fails intermittently