The user guide (http://www.taurus-scada.org/en/stable/users/ui/) should at least contain some explanation of each of the widgets that have a dedicated launcher. But some of them are not documented (taurustrend2d, taurusdevicepanel, taurusconfigbrowser,...)
TODO: All the info present in readthedocs referring to '--help' should not be present in the documentation of the taurus widgets containing launchers: taurustrend, taurustrend2d, taurusplot...
Patches sent by mrosanes have been applied to develop. I did some reorganization/rewriting on the text as part of integration.