I would to check if a programm is installed on the client user his computer.
The program is Nasa World Wind.
http://worldwind.arc.nasa.gov/
Sombody any Idea how its works?
When I check that the programm is installed I add a link to the programm
cant be done with php, and in reality a client would need to give you permission to do this anyway.
you may get away with it using an activeX controll. security would need to be set accordingly by the client though.
