[Zope] calling standard_html_header from external methods

How may I access standard_html_header through acquisition form foo.py? I've tried HEADER=self.standard_html_header() It acquires, but gives me an error on title_or_id, on PARENTS, on whatever. What arguments should I pass to it? Thanks -- "This company has performed an illegal operation and will be shut down. If the problem persists, contact your vendor or appeal to a higher court." - Signal11 on slashdot