Hi all, I need to understand the whole concurrent process or concurrent administration, for e.g I have doubts in when i open a concurrent program--> define..why i have to define the application executable. what are the parameters i have to specify, what is it for?. Like i am curious about this. Basically i am not understanding the whole set of options when i login as system administrator. Will I get any short picture on this from any senior?. Also recommend me a good book or article which explains on Concurrent administration. Does oracle sysadmin covers the troubleshooting part and explains for the novice?. Please spare your time. Thanks in anticipation. Regards, Rag