As a best practice, you should always set up multiple tools release foundations, including a test environment for applying fixes to JD Edwards EnterpriseOne tools releases. This helps ensure that a stable environment exists before you promote fixes to your production environment. You can also use this same principle and procedure to set up multiple foundations of major tools releases, such as Tools Release 9.1 and Tools Release 9.2.
Multi Foundation Implementation Process - Overview:
Windows: Multifoundation with Tools Release 8.97 and Above on Windows Enterprise Server (Doc ID 865621.1)