http://www.pushok.com/help/cvsscc/basic/cvs.html
http://owen.sj.ca.us/~rk/howto/cvs.html
Repository is a directory, it always has a folder "CVSROOT" containing administrative files; other directories contains files similar to the modules but has ",v" and contains history information.
For local dir: setenv CVSROOT /usr/local/src/cvsroot