Is this correct or have I missed something here ?
I don't know what version of window you have, but on mine it is easy to see what branch a file is from. If in your Windows file explorer you use the "Details" view then you will see a few columns like Name, Size, Type, Date Modified, etc. Well, if you right click on the bar that contains all these headings you can choose a few more, among them "CVS Sticky Tag". If that column says MOODLE_14_STABLE then you are on the stable branch. If it says - then you are on HEAD.
To change from one branch to another you use "Update Special" from the CVS submenu on your right-click menu and then choose the branch on the dialog window that comes up.
I hope this helps. I am not very good at explaining things.
A new world opens!