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.
mtrace                                        Interactive debugging
