Load a saved boolean value to remember varibale values between multiple app starts.
See also: SaveBoolean.
Example - Detect First Start
var file = "demofile";
var first = app.LoadBoolean( "first", true, file );
app.ShowPopup( "You ran this demo for the first time!" );
app.ShowPopup( "This is not the first time you have run this demo." );
app.SaveBoolean( "first", false, file );
string: path to file or folder ( “/absolute/...” or “relative/...” )