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Use a Linked Project when your project depends on another (usually a library, such as PEAR). This allows you to use the tag files generated by the other project so that parameter completion and method proposal work with tags from the required library.
For example, if your project uses the PEAR PHP library, you can create a separate project of the PEAR library files, then include it as a Linked Project for your own applications. This will allow you to browse the PEAR classes and get auto-complete help.
To add a linked project, click Add and select a Project File.
To remove a linked project, select it from the list and click Remove.
Once a project has been linked, the tags from the linked project will show up in the Project Code Browser.
Note: The IDE will not refresh the tags from a linked projects. If the linked project has source changes that do not take place in the IDE itself (for example, the source files are edited directly with a text editor) then you should load the project directly into the IDE so that the source files will be retagged.