(A property that you only can access at run-time. Runtime properties can be Read/Write or Read only.)
Service Studio 5.1 Help
Select Variable Window
Service Studio provides a special selector window where you can select the variable you want to use, either in an Assign element of an action flow or in a widget property.
The Select Variable window Show picture presents all the variables that are available in the scope of your action or screen, organized into the folders presented below.
When used in an Assign, the Select Variable window shows the elements that have already been assigned using the assign overlay. See picture.
Contains all the variables that are only available in the local scope of your action or screen. These include input parameters, output parameters, execute action output parameters, local variables, and Record List Runtime Properties.
Contains all the widgets you have created in the screen where you are selecting the variable to handle so you can access its runtime properties. Thus, this folder is only available in screens, screen preparations and screen actions.
Contains all the user defined session variables and the MSISDN session variable (that is only the system Read / Write session variable). See Session variables.
Contains all the user defined site properties. See Site properties.
Contains all the Timers you've created, because you can change the value of the Read / Write Timer Runtime Properties.