Christian Steinhauer writes:

Where must i put the Z_REALM Variable on a Unix OS to running Zope with Z_REALM variable ? You set an environment variable named "Z_REALM". Consult your shell documentation to find out how to set environment variables.

You can also set "Z_REALM=<your_realm>" on the command line that starts Zope. Usually (standard Zope distribution), this is in the "start" script. Dieter