| Interface | Description | 
|---|---|
| IProgressMonitor | 
 The  
IProgressMonitor interface is implemented
 by objects that monitor the progress of an activity; the methods
 in this interface are invoked by code that performs the activity. | 
| Class | Description | 
|---|---|
| NullProgressMonitor | 
 A default progress monitor implementation suitable for
 subclassing. 
 | 
| SubMonitor | 
 A progress monitor that uses a given amount of work ticks from a parent monitor. 
 |