<exit> element
The <exit> element declares an exit task,
indicating that the current context should be terminated. Values may be
sent to the parent context with an embedded send element. The exit task
causes the current context to be destroyed, including any variable and
history state contained in the context.
Syntax
For example, the following will terminate the current
context, and returns control to the parent context.
<exit>
<send value="393"/>
<send value="$X"/>
</exit>