Workflow Background Process from Backend and Unix

Workflow Background Process from Backend :

BEGIN
   wf_engine.background (itemtype           => NULL,
                         minthreshold       => NULL,
                         maxthreshold       => NULL,
                         process_deferred   => TRUE,
                         process_timeout    => FALSE,
                         process_stuck      => FALSE);
END;

Workflow Background Process from Unix :

$ $FND_TOP/Admin/Sql/wfbkg.sql

Workflow Background Process from Frontend :

Navigation : System Administrator --> Requests > Run

Also read : Workflow Background Process in Oracle Apps