Documentation for Subversion (sometimes referred to as "SVN") is available here.
Developer Subversion Access via SSH
Only project developers can access the SVN tree via this method. SSH must be installed on your client machine. Substitute developername with the proper values. Enter your site password when prompted.
svn checkout svn+ssh://firstname.lastname@example.org/svnroot/estimators4nfi/
Data about current and past states of the repository