Find concurrent manager nodes on Oracle Apps

1- Use the following query:
   sqlplus>  select node_name from apps.fnd_nodes where support_cp='Y';

2- Check the variable < TIER_NODE oa_var="s_isConc" >YES< / TIER_NODE> on the context file:
    $ grep s_isConc $CONTEXT_FILE
    YES means that this node is a concurrent manager node.

3- Check for the foundation library (FNDLIBR) processes
     $ ps -ef  | grep FNDLIBR

4- Check the report server processes:
      $ ps -ef | grep ora_rw