+So, you can choose between the following scripts:
+
+ cd <regress>
+ ./nightly-all # does disk and tape testing
+ ./nightly-disk # disk only tests
+
+ ./experimental-all # experimental disk and tape testing
+ ./experimental-disk # experimental disk testing
+
+We recommend that you start with the ./experimental-disk runs so that
+you can check that everything is working fine. Once that is done,
+try a nightly-xxx run. The difference is the experimental runs are just
+that -- they are things where you are experimenting and it is expected that
+something might be broken (bad ctest configuration, experimental source
+code, ...), and nightly runs are not expected to fail.
+
+If you are a developer and you have modified your local Git repository, you
+should be running the experimental tests -- they are designed for developers.
+If you do modify your local repository and commit it, then run a nightly
+test.
+
+If you are just doing testing on a nightly basis (no development in your
+source repository), then please use the nightly tests.
+
+All the old scripts (./do_all, do_file, all-non-root-tests, ...) manually
+run the tests outside of ctest.