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Because these are all separate copies, there is no interference - it is as though all of the developers have their own copy of the same library book, and they're all at work scribbling comments in the margins or rewriting certain pages independently.Developer A finishes her changes and commits them into CVS along with a "log message", which is a comment explaining the nature and purpose of the changes.This process uses the copy-modify-merge model, which works as follows: Developer A requests a working copy (a directory tree containing the files that make up the project) from CVS.This is also known as "checking out" a working copy, like checking a book out of the library. At the same time, other developers may be busy in their own working copies.If you've never used CVS (or any version control system) before, it's easy to get tripped up by some of its underlying assumptions.What seems to cause the most initial confusion about CVS is that it is used for two apparently unrelated purposes: record keeping and collaboration.
Unfortunately, this is just the time when someone usually calls to report a bug in the last publicly released version.
But before we do that, let's take a look at a mechanism that CVS doesn't provide (or at least, doesn't encourage): file locking.
If you've used other version control systems, you may be familiar with the lock-modify-unlock development model, wherein a developer first obtains exclusive write access (a lock) to the file to be edited, makes the changes, and then releases the lock to allow other developers access to the file.
See the GNU General Public License for more details.
This manual describes how to use and administer CVS (Concurrent Versions System).