The MemcheckView GUI uses the Tool Gear viewer to display and organize Memcheck's output in a way that makes it much easier to examine the most-critical Memcheck warnings first. MemcheckView also displays the relevant source code for each warning and the source code can be viewed for the entire call chain, if desired. The MemcheckView package includes scripts (memcheck_all, memcheck) that provide an easy way to run Memcheck on parallel (MPI) and serial applications. Because Memcheck generates its output file on the fly while the application is running, the MemcheckView tool can monitor this output file and update the display continually. MemcheckView can also read a completed output file after the monitored application has exited.