emerge, depending on ‘cvs-idiff-imerge-handlers’) to allow you to view diffs. If a prefix argument is given, PCL-CVS will prompt for a revision against which the diff should be made, else the default will be to use the BASE revision.
emerge, see above) to allow you to do an interactive 3-way merge.
Please note: when the file status is ‘Conflict’, CVS has already performed a merge. The resulting file is not used in any way if you use this command. If you use the q command inside ‘ediff’ (to successfully terminate a merge) the file that CVS created will be overwritten.