It allows you to edit component driver file.
Driver built-in editor serves for editing implementation of methods and events, and includes HTML help files and other files generated by the CDE.
The component driver can be edited by selecting the driver file, select Drivers > sw ><name of the component>.drv file as shown in the figure below.
Figure 1. Component driver file 
The driver editor supports all features supported by the Eclipse Editor. The following are Processor Expert features:
- Color coding
- Error syntax highlight for selected language (if editing driver files) and for macroprocessor language when editing component files
- The code is highlighted
- If an alphabet is typed, the list of words starting with same alphabet is displayed. It is content assist
- The set of code can be folded or expanded
- The text is highlighted with grey color if the same text is repeated in the code. It is occurrence matcher
- If same command is typed more than once then command matcher is displayed
- Hints for commands
The following figures show all the above features.
Figure 2. Driver editor 
Figure 3. Driver editor 