I want to leave my Mac locked, but display a web page (representing a web-based dashboard) in the lock screen. The idea is to leave this web dashboard showing 24x7 but without letting anyone else get access to the rest of the system.
You may be interested in a product my team and I are about to release, called Screensaver Ninja. True to its name, the ninja transforms your screensaver into a rotation of live websites like dashboards, analytics, news, the weather...whatever you need.
Apart from being able to lock your computer as detailed above, you can also choose to lock the screensaver so that whilst everyone can view the data, you must have a keycode to access it.