Setting watch variables in the Tracer tool
Set a watch variable to detect when processing has changed the value of a property. Focus returns to the Tracer window when your work changes the property value.
- On the developer toolbar, click Tracer, or click on an activity, data transform, or service rule form.
 - Click Watch.
 - In the Page Name field, enter the name of the page or enter param for the parameter page.
 - Either enter the property name without a period in front of it in the Property Name field or select Or Page Messages to watch this page for page messages.
 - Click Set Watch.
 - Optional: To remove a watch variable, select the check box in the Remove column and click Remove.
 - Optional: Repeat steps 3 through 5 to add more watch variables.
 - Click Close.