thanks for your reply. You'r right, but it seems to be too much complicated.
There is an exhibit including a touchscreen and an physically 3D printed model of the application in front. On the screen a presentation is running and a visitor can touch the screen to start an explanation, how the application is working. The presentation is easily made with hype (Yeah and by touching the screen, a build-in motor moves the application to show how it works.
What I need is to trigger the motor to the visitors touch on the screen. The motor is controlled by an arduino and therefore I need a communication between the arduino and the presentation.
I will install a WEB-server on the arduino, which is waiting for a call from a client. If the call is comeing in (goto URL from hype) the arduino starts the motor.
This seems to be simple, no PHP or Ajax is needed?
Am I right? Im not sure what happens, if the call is repeated a second time? How to reset it?
What happens to the presentation, if the call (goto URL) is sended? How to terminate this request?
thanks for your suggestions in advance (everything will help :-))