debug-package                       How to use the debug package
bp                                  Breakpoints for debugging
debug.C                             For debugging C-calls with many arguments.
debug.eval                          Evaluate expression in debugging window
fun.locator                         Get environment(s) where an object exists.
get.retval                          Show current return value when debugging
go-skip-qqq                         Flow control for debugger
is.mtraced                          Check if a function has been 'mtrace'd.
last.try.error                      Get last try-error
mtrace                              Interactive debugging
step.into.sysfuns                   Set or get options for which "special" functions get stepped into, when
                                    in step-mode.
