To call on for aid or protection; to invite earnestly or solemnly; to summon; to address in prayer; to solicit or demand by invocation; to implore; as, to invoke the Supreme Being, or to invoke His and blessing.

To call on a God or Goddess to take control of or "possess" the person invoking.

To call into yourself. To invite possession. see Evoke.

evoke or call forth, with or as if by magic; "raise the specter of unemployment"; "he conjured wild birds in the air"; "stir a disturbance"; "call down the spirits from the mountain"

When a task is invoked, first we check to see if it has been invoked before. if it has been, then nothing else is done. If this is the first time its been invoked, then we invoke each of its prerequisites. Finally, we check to see if we need to execute the actions of this task by calling needed?. Finally, if the task is needed, we execute its actions. NOTE: Currently prerequisites are invoked even if the task is not needed. This may change in the future.

One of the CHAIMS language primitives used to initiate remote execution of a megamodule method.

Execute a command or a macro.

To call upon; used especially with reference to subprograms. For example, to invoke a function is to execute the function.