Prevent launching a second copy

You may prevent launching a second copy (or instance) of an already running program by selecting the 'Only one copy' option of the Additional tab of the item configuration dialog.

Internally, this feature of Control Runner works as follows:

1.	When you click on a program button, Control Runner checks whether the 'Only one copy' option has been set.

2.	If so, Control Runner looks for the application in the list of tasks running.

3.	If it finds it, it will try to restore the main window of the running application (if it is minimized, hidden to the System tray or hidden by Control Runner).

For that reason, this feature will work even if the first instance of the application was not launched by Control Runner, but it requires that Control Runner correctly identifies the main window.