12.2 allowcom(Signal)

1. Syntax
   allowcom -sig to domain [c],[k],[s],[n],[o];
2. Meaning
   Allow to send signal to to domain. [c] is sigchld, [k] is sigkill, [s] is sigstop, [n] is signull, [o] is other signals. signull is not supported, this means all domains are allowed to use signull.