Helper variable that controls the display of the predefined ReadmeDlg dialog box: if nonzero, the dialog box is shown; if zero, the dialog box is skipped.
You can refer to this variable as <UIReadmePage>. In conditional expressions you can omit the brackets and use tests like UIReadmePage. Set this variable to 1 to display the ReadmeDlg; set it to 0 to skip that dialog. You can also use a Set Variable action to change its value at installation time.