debug-package                             How to use the debug package
bp                                        Breakpoints for debugging
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.
