Hiya VB people, I'm looking for client operations returned to the server as a variable or somthing

1: Is there a way to read the windows registry of someone browsing a php coded page
2: Is there a way to read a file in a specific location (eg: c:\a.txt, with string "WOW!") of someone browsing a php coded page
2: Is there a way to write a file in a specific location (eg: c:\b.txt -> "COOL!") of someone browsing a php coded page

btw, it doesn't need to be php, any web-based language (like java, flash, java script, html, etc)

The goal of this application is for a server to interact directly to a game installed on a client, like who is playing what online, etc... There may be other ways to do so, but please answer the 3 questions first before suggesting something else, thanks in advance (hopes its possible :|)