Can I detect if the computer is in use?

[Telorast]

I'd like to lower the volume of my speakers in other rooms if the computer is being used and then restore the volume when the computer is unused for a certain time, say 1 minute.

Is there a way to detect if the computer is in use?
Or maybe there is a sensor I could use? Perhaps a laser rangefinder pointing at the user?

[blaher]

The events:

System.Idle
System.Unidle

from memory.

[hello_kitty]

Could you describe how to do it in more details?

[V_J]

If you leave your computer for some time unused, there suddenly will be a new entry in the EventGhost eventlog, with the name system.idle. When you then use a mouse or keyboard, there will be a new event with the name system.unidle. These events could be used to detect if somebody is at the computer or not: system goes idle if nobody is there, system goes unidle if somebody works on the computer.

I'm not sure how you can change the time before the system goes to idle, as on my computer it is quite short: the event system.idle can pop-up when reading a long text on a website, or thinking about a piece of code. But you might just start a timer when the system goes to idle, and if it does not go to unidle with the time set in the timer, you can assume the person is not there.