Related Clues:
- Alerted, in a way
- Went off, maybe
- Metal containing iron turned green?
- Called on a pager
- Went through papers
- Emulated a smoke detector
- Leaned on a horn
- Paged, old-style
- Sounded like R2-D2
- Looked through, as pages
- Confirmed being locked, as a car
- Produced foliage
- Paged quickly?
- Contacted via pager
- Sounded a car horn