The company Widgets Inc. uses a custom ug_english.dat file. After installing UG, they modify ug_english.dat to their liking and place it in r:\ug_shared\ugs180. Everyone in the company uses the same plot_queue HP650_WIDTH except Jan, who usually plots color and prefers the default queue HP650_COLOR. In this case, Administrator would place a text file named ug_english.dat in Jan's home drive and make the following entry in this file:
UG_defaultPlotQueueName: HP650_COLOR
When Jan starts UG via a custom batch file, UGMerge will be executed, merge the two .dat files creating a new .dat file and place that file in the local UGS folder, overwriting the existing ug_english.dat file. That new, local .dat file will now have the appropriate default plot_queue whilst all other users will be using the default plot_queue defined in the global definition file.