When you open multiple projects, use this dialog box to specify which project to open by default, which project's settings to use when you schedule or level, and which project to use by default when you add new information to the database.
Project ID: Lists a brief unique description of a project.
Project: Lists the project description.
Data Date: Lists the data date for the project.
Default: Mark the checkbox to designate one project as the default project to use when you open multiple projects. This project opens automatically the next time you open this group of projects.
When connected to a P6 Professional database: It also uses this project's scheduling and leveling settings for calculating the schedule (manually or via the Job Services feature) and it becomes the default destination for new items such as activities or issues unless you group the layout by WBS and select a different project before adding new items.
When connected to a P6 EPPM database: It also uses this project's scheduling and leveling settings for calculating the schedule and it becomes the default destination for new items such as activities or issues unless you group the layout by WBS and select a different project before adding new items.