debug-package                          How to use the debug package
bp                                     Breakpoints for debugging
debug.C                                For debugging C-calls with many arguments.
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.
