The ??DS (Discontinue) command discontinues the task identified by the given mix number. If the command is entered without a mix number, all ordinary tasks are discontinued.
If a discontinued task does not terminate and the CONTROLLER is functioning normally, subjecting the task to ??DS is no more likely to result in task termination than a nonprimitive DS command.
Syntax

Explanation
??DS
Discontinues all ordinary tasks.
?? <mix number> DS
Discontinues the task identified by the mix number.