anyhow

I want to block access to a file or folder using java such that only the java program could access it.
Any other means such a double click on folder or file should show that access has been denied or somewhat appropriate message as desired.
I have tried the lock files in java but it doesn't prevent access by double click.
Help needed quickly.

I want to know about a "siemens" router without having admin rights to it.Is it possible??
Also i want to know if i can forward a port?? I seems all the ports are closed .
My torrent client utorrent is having problem connecting as it limits the network traffic.

If it is possible, please tell me the method.