%contextKill()

Aliases%contextKill( )
Parameters[integer @contextId]

    Kills the current context, or if @contextId is set then kills the
associated context (if valid). If an associated context is killed then 1
is returned; otherwise 0 is returned. Note that the context is not killed
immediately, but rather is queued for killing when next it runs (the
context will not be able to run any more code).