Motif permits experienced application programmers to extend or override the data transfer capabilities of many Motif widgets. However, data transfer is typically the responsibility of widgets rather than applications. For this reason, complete details of UTM data transfer are found in the Motif Widget Writer's Guide. The UTM information in that book is a prerequisite for understanding this chapter. Nevertheless, we do begin this chapter with a brief overview of UTM from the application programmer's perspective. After this overview, the chapter suggests a few relatively straightforward ways in which an application might use UTM.