Identifying base version-no of all files in a branch

[mthread]

Hi,
   Is there a CVS command that will provide me with version no(base version) of 
all the files in a branch.
   What I mean by 'base version' here is...the version no of all the files in a 
branch..when the branch was first created.
   I want to create a plugin in Eclipse...through which I can retrieved the 
base version no of all the files in a branch.
   Thanks every one in advance