Helper variable that controls the running any post-installation actions. It is linked to the Start the application check box on the predefined FinishDlg dialog box and used as a condition for the final actions in the predefined UIFirstInstall action sequence on the Actions project page.
You can refer to this variable as <UIRunApp>. In conditional expressions you can omit the brackets and use tests like UIRunApp. By default this variable is set to 0, so the user must check the Start the application check box on the predefined FinishDlg dialog box before continuing. However, you can set this variable to 1 to pre-check the Start the application box. You can also use a Set Variable action to change its value at installation time.