In the "Registry on Target machine" in my setup program (visual studio .net)

1. How do I put my application path to the HKEY_LOCAL_MACHINE ? In other
words I want to store tha path where my application is installed into the
registry and how do I do it?

2. If I succeed in the first question, then how do I retrieve the path of
Myapplication from another application?

thanks
Newbie