m_JobBegin -j SAMPLEJCL -s START -v 2.0 -c R
m_JobSetExecLocation "ATLANTA"
  while true ;
  do
         m_PhaseBegin
 ...
m_JobEnd

The job can be submitted on any JES node, but only be executed by the ARTJESINITIATOR which belongs to JES's Tuxedo server group ATLANTA.