Difference between RO-Properties and TO-Properties And Optional Step in QTP

What is optional step in QTP and how to use it?


    *  An optional step is a step that is not necessarily required to successfully complete a run session.
    * During a run session, if the object of an optional step does not exist in the application QTP  bypasses this step and continues to run the test
    * To set a step as optional in keyword view right click on the step and select Optional Step
    * Alternatively, you can directly write the keyword "OptionalStep" preceding a statement to make it optional


Ex: OptionalStep.Browser( ).Page( ).Dialog("Warning").WinButton("OK").Click



What is the difference between RO-Properties and TO-Properties in QTP?


The difference between RO-Properties and TO-Properties are that TO properties refer to the properties as they exist in the Test Object saved in the test (i.e. in the object repository or as described in descriptive programming) and the RO-Properties refer to the RunTime object (i.e. the object as it appears in the Application Under Test (AUT)).

From this distinction a few things arise

   1. Accessing a TO property doesn't require the AUT to be open
   2. Accessing an RO property requires the AUT to be open and the object to be uniquely described
   3. You can set the value of a TO property but not that of an RO property