Exactly. For example, in the riding of Vancouver-East, a lawyer could prepare affidavits for a group of individuals and certify that they could all vote. In areas where there is a large homeless population, this gives these people an opportunity to vote. Otherwise, each person would have to find someone to vouch for them, because these people do not have a permanent address, and so on.
On February 20th, 2007. See this statement in context.