Show Breakpoints Window toggles the Breakpoints window on or off.

Show Debugger Tools Window toggles the display of the Debugger Tools window on or off.

StackComplete[expr] evaluates expr with intermediate expressions in evaluation chains included on the stack.

StackBegin[expr] evaluates expr, starting a fresh evaluation stack.

StackInhibit[expr] evaluates expr without modifying the evaluation stack.

Stack[] shows the current evaluation stack, giving a list of the tags associated with evaluations that are currently being done. Stack[pattern] gives a list of expressions ...

TraceAbove is an option for Trace and related functions which specifies whether to include evaluation chains which contain the evaluation chain containing the pattern form ...

TraceForward is an option for Trace and related functions which specifies whether to include later expressions on the evaluation chain that contains the pattern form sought.

TraceBackward is an option for Trace and related functions which specifies whether to include preceding expressions on the evaluation chain that contains the pattern form ...

DialogProlog is an option for Dialog that can give an expression to evaluate before the dialog starts.