In order to setup a breakpoint, open the desired code, select the line and press the Insert Breakpoint at the toolbar.

When the system stops on a breakpoint you can perform step by step execution or hit the continue button.

In order to inspect local .NET variables, tags or project objects, you can select the text in the script editor and, when the execution is stopped on a breakpoint, the toolkit will show the current value of the variable.

You can also add .NET variables or project objects to the Watch window. When adding tags or project objects, you need to use the @ symbols, example @tag.tag1, so the system knows it is a project object, not a local .NET variable. Keep in mind the Watch display is only updated when the execution is stopped. If you want to have real-time values for tags and objects you can open the PropertyWatch diagnostics tool.