Like the perpetually moving rabbit of TV fame, Second Life on this computer just keeps going and going and going. The automatic shutdown after a certain period without keypresses or mouse activity just doesn't engage. It's not a hundred percent certain but it happens a lot.
This is not a problem to me so long as the sound is turned down but I thought, the technical people ought to know, and I have filed a bug report about it, but also, just because someone does not get shutdown but won't respond to any prodding does not mean that they are using a keystroke macro program or mouse clicker program to stay online, it just means that Second Life's automatic shutdown is failing to work properly.