The Debug Viewer pane contains three tabs to assist you in debugging your test or component—Watch Expressions, Variables, and Command. Watch Expressions The Watch Expressions tab enables you to view the current value of any variable or other VBScript expression. Variables The Variables tab enables you to view the current value of all variables that have been recognized up to the last step performed in the run session. Command The Command tab enables you to execute a line of script in order to set or modify the current value of a variable or VBScript object in your test or component. When you continue the run session, QuickTest uses the new value that was set in the command.