Individual co-expressions are color coded for identification. Clicking on a box brings up a dialog with information about the nature of the activity, where in the program it occurred, and so on. The control window allows the user to control monitoring. In addition, there may be one or more file windows showing individual files. As data is read and written, it is shown in the file window with the current position highlighted.
Various information is shown in the top part of the display.
There are four monitoring channels below, allowing four different kinds of activity to be monitored simultaneously. Many kinds of events can be monitored, including various types of expression evaluation, allocation, and even virtual machine instructions. Events are represented hierarchically. At the top level, there are general categories like expression evaluation. At lower levels the events become more specialized, such as function, operator, procedure, and assignment activity.