>I am trying to make my application to work only on this computer on which is installed. How can make when it is moved to another computer to deny working and show message to the user.

Hi Mario,

Try using a dongle device. With a dongle (which is a hardware device that
plugs into the parallel port and is transparent to the user) you can
limit your software to be used on only 1 machine at a time. This means
that your user can put your program on any machine they have but it will
only run on the machine that has the dongle installed. Check it out
it works like a charm!

Hugh