[Zope] INSTANCE_HOME and inituser

My experiments with multiple instances using INSTANCE_HOME (etc.) have convinced me that each INSTANCE_HOME should probably have its own inituser, either created freshly or copied from wherever var/Data.fs was copied from (SOFTWARE_HOME, another instance, etc.). Otherwise you end up not being able to log in to ZMI as the admin user. I haven't seen this documented anywhere. Should it be? -- --- Mitchell