[otrs] Where are the <OTRS_TICKET_*> options defined?

I'm looking for a way to add a ticket's priority to an agent notification. I was wondering if anyone knows where (in which file or module) the usable options such as are defined? If I could find this I might be able to make an option. I don't really care if it is numeric, so long as something is there. Thanks ============================== Dan Matthews Network Administrator Coleman Professional Services Phone: 330-676-6862 ============================== -------------------------------------------------------- POTENTIAL CONFIDENTIAL INFORMATION ENCLOSED This information and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the sender and delete and destroy this message and its attachments. All health information MUST be protected. Any protected health information (PHI) enclosed is protected by Federal confidentiality rules (42 CFR Part 2) and/or Ohio law (O.R.C. 5122.31; O.A.C. 5122-27-09). The Federal rules and Ohio law prohibit you from making any further disclosure of this information unless further disclosure is expressly permitted by the written consent of the person to whom it pertains or is otherwise permitted by 42 CFR Part 2 and applicable Ohio law. A general authorization for the release of medical or other information is not sufficient for this purpose. The Federal rules restrict any use of the information to criminally investigate or prosecute any alcohol or drug abuse patient.