There are two ways to enabling tracing in Jinitiator
From client machine, Open the Jinitiator Control Panel.
On Windows select Start - Settings -
Control Panel - Jinitiator 1.3.1.x. Enter the following in the "java Run Time parameters" textfield:
Tracing set through the Control Panel will take effect when the Plug-in is launched, but changes made through the Control Panel while a Plug-in is running will have no effect until restart.
You can see the trace information in the jinitiator console or in the file
C:\Documents and Settings\\jinitiator131x.trace
The other method is relatively simple
This method assumes you are running a web forms application and the Java Console is active. Press an appropriate number using your alphanumeric keypad (0-5).
This enables tracing on the fly.
The trace level options (0-5) are increasingly verbose with the various levels corresponding to the following:
0 - off
1 - basic
2 - network and basic
3 - security, network and basic
4 - extension, security, network and basic
5 - LiveConnect, extension, security, network and basic