Version Control allows only one person to work on a shared project (or a part of a shared project) at a time. When other team members try to make changes to the project while it is checked out, they will be warned that the project is already in use. This prevents team members from overwriting each other's changes.
If you mistakenly check out a project, you can undo the check out.
When checking in changes, use the Comment field to provide brief descriptions of your changes. The comments you provide are displayed in the Project History window - along with the project's date and time and name of the project creator - to help you discern between versions. For more information about viewing project history and restoring a project, see Restoring a project.
The primary owners of projects can apply or undo the checkout changes made by a user to a project.
To check out a project (or a part of a project):
Open the project in the Publisher.
Select the chapter, section, or page in the Project Explorer that you want to check out. Select the project level if you want to check out the entire project.
Click the Check Out graphic 
on the Project Explorer bar or right-click and select Version Control > Check Out.
A green box appears around the graphic.
To check in a project (or a part of a project):
Open the project in the Publisher.
Select the chapter, section, or page in the Project Explorer that you want to check in. Select the project level if you want to check in the entire project.
Click the Check In graphic 
on the Project Explorer bar or right-click and select Version Control > Check In.
The Check In window opens.
Enter a comment that describes the changes you added to the project.
Enable the Keep Checked Out box if you want to submit your changes but retain the checked-out status. This allows you to keep updating the project without having to repeatedly check it out.
Click OK.
To undo a check out:
Open the project in the Publisher.
Select the chapter, section, or page in the Project Explorer that you want to check in. Select the project level if you want to check in the entire project.
Click the Undo Check Out graphic 
on the Project Explorer bar or right-click and select Version Control > Undo Check Out.
To refresh the check out status, click :the Refresh Project Check Outs graphic 
on the Project Explorer bar.
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