cvs: newbie question rtag vs. tag

[KM]

 
I know obviously that some commands w/ the Rs in them are due to RCS like rlog 
and log.  
 
for cvs rtag and cvs tag ... is it the same difference?  rtag tags the 
repository and tag the working directory.  I was tagging the HEAD as the final 
build to use later as a branch point if necessary.  I used rtag.  just making 
sure I am correct.
 
Sorry for so many quesitons.
KM