Dealing with the non-sense of WEBSENSE?
first off you should post as much as you know about the car alarm itself to get a good answer as they are not all the same. Also year, make, model of the car would help a lot. You can try unplugging the main harness going into the brain which may or may not help you depending on how kill switch is wired. Most are wired so that starter is disconnected when car is armed and the brain is controlling that so sometimes you can get around that by pulling main harness to the brain. i assumed you tried using the remote to disarm the unit and if it didn't work you attempted to try a new battery to make battery didn't just go dead on remote. will try to help more once you post more info
Look along the edges and find where the old spline starts/stops. Using a small flat head screwdriver lift the spline then pull it out all the way around. The screen will come out then. If the old spline is still in good condition it can be reused. If you new new spline, take a piece of the old one with you as they are sold in different diameters to fit the different sized frame channels. The best way to do that is to use some spring clamps, clamping the new screen onto the frame on each corner. Using your screen spline roller tool, start in one corner and apply steady pressure rolling the spline into the track of the door frame. Be careful as too much pressure will cause the tool to skip out of the track and cut the new screen material. You might have to pull the new screen material a little to tighten it as you go along. When you get to the last corner, cut the spline with a utility knife. The screen should be pretty tight on the frame when finished. If not, back to the drawing board to start over. One thing I almost forgot to tell you, you might have to remove the rollers and you will need to remove the handel before you start. Just a couple of screws to remove that's all. I do mine on the patio floor and that works out well for me.
Stirling engine tech is used in some distributed electrical power generation applications and I know some companies who still play in this particular technology.