Sometimes working with just one project file does not allow you to accomplish your objectives. Working in a Windows environment typically offers the capability to work with more than one file at a time, and this is certainly true with Microsoft Project.
Consider the following situations when it would be beneficial to work with more than one file at a time:
A task in one project might depend on a task in another project. For example, the start date for one task might need to be linked to the start or finish date for a task in another project.
Several projects, managed by different people, might be placed under the supervision of a manager who coordinates dates and resources between the various projects.
A project might ...