UIShowRunApp
Helper variable that controls the display of the Start the application check box on the predefined FinishDlg dialog box. It shows or hides this check box through the OnInitDialog event handler. You can set a default value (nonzero to show the Start the application check box, zero to hide it) in your project. However, the installer resets this variable to 0 if a reboot is required at the end of the installation, because in that case the application cannot be safely started.
Usage
You can refer to this variable as <UIShowRunApp>. In conditional expressions you can omit the brackets and use tests like UIShowRunApp. By default this variable is set to 1 to make the Start the application check box visible. However, you can set this variable to 0 suppress that box. You can also use a Set Variable action to change its value at installation time.