Installation and Upgrade > Installation and Configuration Guide - Update Existing Installation > Updating an Existing Installation > Announcing System Availability
  
Announcing System Availability
After bringing your system back online and completing the special instructions described in the Windchill Read This First, you can announce that users can log on.
Explain that some users will experience downloads of updates and may be required to perform re-installations of some applications (depending upon your site usage of client applications).