The debugger has four other windows that allow you to monitor variables and expressions. These windows are as follows:
A Popup Monitor window monitors single variables or expressions. This window is associated with a specific source window and closes when the associated window closes.
The Program Monitor, Private Monitor, and Storage Monitor windows are used as collectors for individual variables or expressions in which you might be interested.
The difference between the Private Monitor window and the Program Monitor window is the length of time that each remains open. The Program Monitor window remains open for the entire debugging session. The Private Monitor window is associated with the source window from which it was opened and closes when its associated view is closed.