What power does the caretaker government have?

Right now we have a caretaker government in place, and the country is expected to remain in limbo at least until the end of the month, but it could be much longer. Some Ministers are about to lose their warrants, effectively their licence to do the job, because they haven't been re-elected. So what power does a caretaker government actually have? Public Law Advisor at Simpson Grierson, Sally McKechnie spoke to Lisa Owen.