This parameter acts as the default suffix of accounting identifiers.
With each application connect request, an accounting identifier consisting of a DB2 Connect™-generated prefix and the user supplied suffix is sent from the application requester to a DRDA® application server. This accounting information provides a mechanism for system administrators to associate resource usage with each user access.
The suffix is supplied by the application program calling the sqlesact() API or the user setting the environment variable DB2ACCOUNT. If a suffix is not supplied by either the API or environment variable, DB2 Connect uses the value of this parameter as the default suffix value. This parameter is particularly useful for earlier database clients (anything before version 2) that do not have the capability to forward an accounting string to DB2 Connect.