Each time a program is launched using the menu Build->Run, a new
execution window is created to provide input and output for this program.
In order to allow post mortem analysis and copy/pasting, the execution windows are not destroyed when the application terminates.
To close an execution window, click on the cross icon on the top right corner
of the window, or use the menu File->Close, or the menu
Window->Close or the key binding <Ctrl-W>.
If you close the execution window while the application is still running, a dialog window is displayed, asking whether you want to kill the application, or to cancel the close operation.