def METHOD_NAME (self, scanner, target, vtarget):
    """ Installs the specified scanner on actual target 'target'.
        vtarget: virtual target from which 'target' was actualized.
    """
    assert isinstance(scanner, Scanner)
    assert isinstance(target, basestring)
    assert isinstance(vtarget, basestring)
    engine = self.manager_.engine()
    engine.set_target_variable(target, "HDRSCAN", scanner.pattern())
    if scanner not in self.exported_scanners_:
        exported_name = "scanner_" + str(self.count_)
        self.count_ = self.count_ + 1
        self.exported_scanners_[scanner] = exported_name
        bjam.import_rule("", exported_name, scanner.process)
    else:
        exported_name = self.exported_scanners_[scanner]
    engine.set_target_variable(target, "HDRRULE", exported_name)
    # scanner reflects difference in properties affecting
    # binding of 'target', which will be known when processing
    # includes for it, will give information on how to
    # interpret quoted includes.
    engine.set_target_variable(target, "HDRGRIST", str(id(scanner)))
    pass