What is meant by the style names?

[arakish]

In the Style Editor, there is a list of style names that make no sense to me no matter how much I study the properties and values under each.

Listed below are my best guesses:

clsNode - how the node looks when the page loads.
clsNode:hover - how the node looks when the cursor is hovered over the node.
clsNodeSelected - how the node looks when it is selected (how is it selected? onmouseclick, on expansion?)

These I figure are the same as a:link
clsCMTopOn
clsCMTopOver
clsCMOn
clsCMOver

These I figure are the same as a:visited
clsCMVTopOn
clsCMVTopOver
clsCMVOn
clsCMVOver

However, I need further explanation of what exactly is meant by this on and over and topon and topover.

Thanks for any help.

rmfr