Who is Involved With Source Control?
The number of individuals involved depends on how you work in your company. Someone (perhaps a network administrator) needs to set up your source control system, repository, etc. outside of Lingo; this individual may also set up the "rights" to all persons who have access to the necessary files.
If you are working on a team, each person on the team needs to have a local copy of the Lingo project that is bound to the remote clone of the project files. Each person is responsible for moving changed files to and from the remote location.