Hi Yousuf,
If the method setUserAlias("userid") has been invoked, in the system log, the alias name will be appended to the actual cmod system id (pattern : CMOD ID - ALIAS NAME) under User id column.
We can invoke setUserAlias API more than 1 times for a single ODServer object. With that said, assume 2 different users are trying to access cmod and inside your java service/class both requests are being served by single odserver object. In this case, we can differentiate the user requests in cmod systemlog if we set the Alias.
Thanks,
TNVP..