exact difference between RELENG_4, RELENG_4_5 . . . RELENG_4_8

[Richard Schilling]

Read the documentation on the meaning of the various 4.X tags, and am 
not sure what is meant by this:

"The release branch for FreeBSD-4.6 and FreeBSD-4.6.2, used only for 
security advisories and other seriously critical fixes."

Similar descriptions are used for the other RELENG_4_X tags.

If I specify RELENG_4 will cvsup also include RELENG_4_3 to RELENG_4_8?

Sorry folks - I'm just getting wet behind the ears with cvsup.

--Richard