In custom applications for Microsoft Office Project Server 2007, it is sometimes necessary to impersonate another user. When a custom application calls the Project Server Interface (PSI) through the Project Web Access site, Project Server restricts the application user to that user's set of Project Server permissions. Custom applications can also make direct calls to the PSI through the Shared Service Provider Web application that hosts Project Web Access. With direct PSI calls, the application user can impersonate a Project Server user with a different set of permissions.

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