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MPS project can use various resources that reside inside or outside the project directory. These resources are always referenced in terms of relative paths.

If a project is represented in the standard format, the paths are relative to the directory where the *.ipr file resides. If a project is in the directory-based format, the paths are relative to the directory where the .idea directory resides.

The paths for a module are stored relative to the directory containing *.iml file.

Using path variables enables you to store the projects paths as named variables in the format <path name>-<value>.

On saving a project, all occurrences of the local paths, specified as variables, are replaced with the macros in the format $<path name>$.

When a project opens on a different computer, MPS replaces the macros with the respective local path values. If such shared project opens on a computer that does not have the needed path variables, IDE requires to define them.

Path variables are defined in the Path Variables page of the Settings dialog.

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