Attaching BeanShell to a Running Process

Hi,
I was working with AdaptJ Stacktrace yesterday and I am wondered how
it uses BeanShell to communicate with a running java process.
Stacktrace allows you to select an already running java process and
allows you to attaches a BeanShell console to that process.
Thereafter, you can simply run BeanShell commands inside that process.
I want to know, how can we run a beanshell snippet inside a running
process? Note that neither the target process has BeanShell jars in
its class path nor the process is run with attach mechanism (JMX)
enabled. Even, JConsole cannot attach to the process.

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