Windows2003 Enterprise Edition
The IIS_WPG group is a user group provided by IIS 6.0. IIS_WPG group membership provides the minimum set of user rights and permissions required to run an application. It provides a convenient way to use a specific user account, which would be a member of IIS_WPG, for the application pool identity without having to manually assign the user rights and permissions to that account. In a case where the user account is not in the IIS_WPG group and it does not have the appropriate permissions, the worker process serving the application pool will fail to start.
Note By default, the IIS_WPG group does not have the right to start CGI processes. If you create a new account and add it to the IIS_WPG group to run as a worker process identity, you still must assign this new account two user rights to start CGI processes. These user rights are Adjust memory quotas for a process and Replace a process level token.