To query multiple projects at one time, select Query Projects from the Server Home page. The Query Across Projects form will be displayed.
This page works very similar to the Query Items page, except it allows you to select projects from the Project list to query multiple projects. Also, since Categories and Milestones are project specific the Category and Milestone lists are disabled. You must use the Query Items form inside a project to use Category or Milestone as search criteria.
The Project list contains the names of all the projects that you have permission to. You can select a single project or multiple projects from the Project list. (All) is selected by default. If (All) is selected, the items in all projects that you have permission to that fit your search criteria will be returned.