By default, VSS prevents more than one user from checking out the same file at the same time. However, as the VSS administrator you can allow multiple users to check out a file simultaneously.
Note To enable multiple checkouts on a project-by-project basis, you must edit the appropriate .INI variable in each project in which you want to enable multiple checkouts.
For example, to enable multiple checkouts in the project "Features," the .INI file would display:
[$/Features]
Multiple_Checkouts = yes
To enable multiple checkouts: