What is my apex-session?  (when using oauth)

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    My goal is just to run through an example of setting up oauth to access a restful data service running on ords.  I am going through an example to access a workspace in ords using the following webpage (Oracle APEX Tips: Setting up and consuming your data securely with ORDS )

     

    How do I figure out my application id and session id?

    It asks me to put them in the following URL

     

    http://example.com/ords/company_reports/hr/empinfo/?_apex_session=114,16530545902770

     

    Any documentation or thoughts or other examples would be helpful.