When you exit your first Purify session, Purify automatically creates a .purify.Xdefaults file in your home directory. You can edit this file directly from the Viewer (as well as in a text editor) in order to customize the Viewer. For example, you can:
Define the number of lines of source code displayed in a message
Change background and highlight colors, and the size and color of fonts
Color code messages
Purify simplifies the task of customizing the Viewer by letting you edit the .purify.Xdefaults file directly from the Viewer:
Select Options > Edit X resources to open the .purify.Xdefaults file.
Edit the .purify.Xdefaults file using your editor.
The .purify.Xdefaults file uses a typical .Xdefaults file format. For more information about editing an .Xdefaults file, see your X Window System Users Guide.
Restart the Viewer for the changes to take effect.