Online Viewers and Modify windows are the main tools to handle online-data. The architecture of OATs make it possible to view and modify data from a running controller even without any source code.
Online Viewers allow to "step into" or "zoom into" instances on remote controllers to view the contained elements.
The process of "stepping into instances" may go down to the final intrinsic data types like BOOL, LREAL or STRING.
Using Online Modifier you can change values within any object. This includes the linkage of data elements only limited by the features of the used programming language. As an extreme you can "reprogram the wiring" of a running function block.