[jdunck]

> Do homeless people have a single canonical name that they will use consistently?

They have an identity.

> Is it fair to request that they structure their day around a hashing algorithm that they don't understand?

It is not fair that they are homeless. It is not fair that the best thing for many of them to do is to stand in line starting at 3AM the previous day to get a bed for a night. It is fair to offer them a fair chance at a shower in a predictable way. Rather than standing in line for hours in hopes of a shower, they can come and maybe get a shower... or not. Unfortunately, rationing is necessary.

The tokens idea is interesting, but the meaning of them is a good bit more abstract than remembering a single time. Also, things get lost, and keeping things is pretty hard when you're homeless - basically everything you hope to keep has to be carried with you at all times.