How chrome executable autorun?

Question

So, on http://google.com/chrome/ you can download chrome. You chose chrome channel and accept EULA. Web installer starts download and after few seconds autolaunch itself and immediatly starts installing chrome (!) No Windows popups "Are you sure that you want launch executable?". Just starts.

How it done? It also written on GWT, is it matter? Or maybe it because executable signed by google? But in that way it's cant autorun, just downloads and starts only by clicking.

Answer 1

Chrome uses a .NET ClickOnce installer, which can be autostarted from IE. Note that in case of other browsers (confirmed for Firefox), you explicitly have to download the .exe, just like any other executable file.

As for not asking for elevated rights, it's because it installs itself to your user's folder, not in Program Files.