The optional argument PREFIX, if non-nil, should be a key sequence;
then we display only bindings that start with that prefix.
The optional argument MENUS, if non-nil, says to mention menu bindings.
The optional argument PREFIX, if non-nil, should be a key sequence;
then we display only bindings that start with that prefix.
The optional argument MENUS, if non-nil, says to mention menu bindings.