Interjections
Interjections by other senators when a senator is speaking are technically contrary to standing order 197 and disorderly. In practice, interjections which are not disruptive are tolerated, particularly if they facilitate the exchange of views and arguments in debate.
A senator has the right to be heard in silence, however, and the chair will protect from interjections a senator who asks to be protected.[111]
The old parliamentary practice of interjecting “hear, hear” as a sign of approbation is tolerated, but applause is disorderly.