text: When you work with more than one instance, you must identify the instance name when you 
  run Content Manager OnDemand commands, such as**ADDRPTOND**and**STRMONOND**. You can 
  specify the instance name as a command parameter each time that you run a command. Or, 
  you can set up a data area on your system that identifies the default instance name and then 
  specify only the instance name as a command parameter when you must specify a name 
  other than the default. 
  
  Each instance has different security from other instances on the same machine. You define 
  users and groups to each instance and set application group and folder permissions for users 
  in each instance. Each instance has its own system log. 