You
must check out files before you start modifying them. To check out files, on
the Team menu, click Check Out. You can select multiple
files/folders to check out.
In the Check Out dialog box shown above, all selected files will be checked out. Also from this dialog box, you can change your default task and specify a check-out comment.
Before
the above dialog box appears, you will be notified if the check out would
result in any parallel versions.
If
you want to check out all files and folders belonging to a folder, on the Team menu, click Check Out Tree.
Note An object may be automatically checked out by the integration if the
user modifies its contents without explicitly checking out the file. This will
not occur, however, if the user modifies the object using an external editor.