When I wrote "battery status" I meant either on or off not the level.
I wasn't completely sure how it worked, my previous post was just trying to organize some thoughts on this project...while still thinking about the overall picture of using a laptop for a carpc. Maybe we should start a howto faq for laptops in a car.
I was thinking I could make something for the serial port that could switch devices such as the amp on and off...
A nice thing for this program to do would be to watch to see if a program crashes then restart it, then it would be a battery and software watchdog.
An even more ambitious version of this program would be to make it a shell replacement.
Another idea would be to check that xp is setup correctly like showing if ewf or horm is on/off.
Some of the above might be beyond the scope of this program
You should also link to this faq: Do-It-Yourself Startup/Shutdown Controllers