There are two process variables that are available to all
activities that accept input: $_globalVariables and
$_processContext. $_globalVariables contains the list of
global variables defined on the Global Variables tab of the
project.  $_processContext contains general information
about the process, such as the process ID, the project name,
whether the process was restarted from a checkpoint, and so
on.This process Context variable will be created
automatically whenever we create an project