Oracle Documentation

Oracle provides documentation on several locations:

OTN, the Oracle Technical Network (http://otn.oracle.com/). To access most of the contents a free login is required.
Metalink (http://metalink.oracle.com/). This site is reserved for users with a support contract. A support identifier (SID) is needed to create a login.
Discussion Forums (http://www.oracle.com/forums/). Part of the OTN and also searchable through Metalink. The general documentation can be found on the OTN (http://otn.oracle.com/docs/). These are the same sets of documentation included on the distribution CDs.

Internal documents are called Notes and identified by a number. You can find them on Metalink, but if you don't have access you can search the forums, as many are posted there by the support staff.

General Documentation

Oracle Intelligent Agent - [1]
Intelligent Agent FAQ - [2]
ORATCL Quick Reference - [3]
OraTCL FAQ - [4]

Oracle Notes relevant for Tcl:

Note:69597.1 - Overview of the Job TCL Files Used by the Intelligent Agent (16-APR- 1999 - 15-APR- 2002) [5]
Note:69563.1 - Overview of the Event TCL Files Used by the Intelligent Agent (15-APR- 1999 - 15-APR- 2002)

[6]

Note:69598.1 - Overview of the Miscellaneous TCL Files Used by the Intelligent Agent (16-APR- 1999 - 15-APR- 2002)

[7]

Note:62463.1 - Detailed Guide on How the Intelligent Agent Works (04-SEP-1998 - 12-APR-2002) [8]
Note:1017043.6 - WHAT ARE THE ORATCL EXTENSIONS USED FOR TCL SCRIPTS? (08-APR-1996 - 16-DEC-1996) [9]
Note:115961.1 - Logging and Tracing the Intelligent Agent (26-JUL-2000 - 12-APR-2002) [10]
Note:1017042.6 - HOW CAN I USE TCL AGENT SCRIPTS WITH ORACLE ENTERPRISE MANAGER? (08-APR- 1996 - 16-DEC- 1996) [11]

1996 ??? Must have been Tcl 7.4 or so.

How to set up an example user defined event [12]