Khan's external interface is still experimental, so there's only one
task that is currently useful:
[%fard p=(fyrd cage)]
Run a thread from within Arvo
p contains the thread location, name, and start arguments. See the
fyrd data type reference entry for details.
When the thread finishes, either by succeeding or failing, Khan will return an
gift, which looks like :
[%arow p=(avow cage)]
p either contains the result in a
cage, or an error and stack trace if it failed. See the
avow data type reference entry for details.