iPrint Appliance - Updating Client

We would like to know how to update the iPrint clients that reside on the iPrint Appliance.

Intuitively, this seems like something which should be update-able through the iManager update interface. Looking at this from a windows mindframe, it looks like we need to download the files and overwrite the current files on the VAR volume. How is this VAR volume accessed from windows?

Any advice?