(udb) KSR' s interactive {source level debugger} for serial and parallel programs written in {KSR}, Fortran, KSR C and KSR1assembly language.Udb is a source level debugger for testing and debugging serial and parallel programsit is compatible with GDB and dbx.The user can direct udb either by typing commands or graphically through an X-based window interfacethe latter provides simultaneous display of source code, I/O and instructions.For parallel programs, operations can be carried out per-thread.{Start (http://www.tc.cornell.edu/Parallel.Tools/tools/udb.html)}.(1995-05-07)