Customizing the Bookreader Display Most DECwindows applications provide dialog boxes that contain options for customizing your DECwindows environ- ment and saving your settings. However, Bookreader does not provide such an option. To change and save settings in Bookreader, you must specify the settings in a resource file. Note Use extreme caution when modifying resources. DECwindows does not provide error handling for re- sources. Syntax errors in resource files may cause DECwindows to fail, without providing error mes- sages.