Nearly all nontrivial projects need more than one developer and/or take more than a week of work. On such projects, you
will need to compare historical versions of the same file to determine when (and/or by whom) changes were introduced. You
will need to control and manage source changes.References). It is a flexible tool, featuring TCP/IP access, optional enhanced security (by using the secure shell
ssh protocol as a back-end), excellent administration through scripting, and even a graphical interface. Many other VCS products either treat
cvs as a standard to emulate, or build new functionality on top of it.