GCPW gets the user's Windows username from the Directory and looks for the matching profile or AD username on the device. When the user signs in to the device for the first time after you install GCPW, GCPW checks the user's information in the Directory for Windows usernames. The custom attribute specifies the user’s username for their local or AD Windows profile. GCPW associates a user’s Google Account with an existing local or AD Windows profile based on a custom attribute you add in Google Directory. With this approach, when the user signs in to the device for the first time, GCPW creates a Windows profile and associates their Google Account with the new profile. To create a new Windows profile to associate with a user’s Google Account, skip the instructions in this article and Install GCPW.