If a workstation belongs to a Windows domain and a Windows user exists on both the Domain and the Local (on the workstation), the Local user logon takes precedence.
This is especially important as the install can optionally create a user account. It will update the configuration file for the LANSA Web Server Extension and/or the User Registration for the Data/Application Server to use the specified user. The specified user is saved with its base name, i.e., without the qualifying Domain name or Computer name