Reasonable enough. As per Mike's suggestion below, building a few web pages to document the apps is a good start. To expand on that idea, you could write daemons/cron jobs, perhaps in Python if Python runs on OS/400, that monitor each app's status and log that information to the web server. You could then write a web application that takes the monitoring data and formats it appropriately for human consumption. Perhaps an RSS or Atom feed for each application's status.
I don't know anything about OS/400, but if it has a tool similar to syslog, you could configure the application hosts to report their status to a remote syslogd, perhaps on your web server, and parse the log file for the status data. -- http://mail.python.org/mailman/listinfo/python-list
