First: nothing is updated if you don't run an update command!

Second: under the following conditions, console messages similar to those of a CVS update command will be displayed:

• you run a diff of a text file with the "full context" option enabled
• you have given two revisions or tags in the diff dialog

To be able to display the full context diff, MacCVSClient has to

1. retrieve the diff-base revision of the file (this actually is the context the diff data will be displayed in)
2. run the diff to get the diff data

This retrieving the diff-base revision results in console messages similar to those of a CVS update command. Mind you, even under these circumstances, running a CVS diff never results in your working files being updated.