In the PmData object, the #vars identifier is used to enable data items (Var type) defined on the Data page. This identifier can be used in methods working with application object tree (e.g. for the Pm method), or for the PP binding in the application and in panels. For example the Pm method ("data1/#vars/aaa") returns the data item aaa from the object named data1 of the PmData type.
References to Data extensions objects in the Var variable can also be done directly by extending the path of the Pm method using the #ext identifier. This can be used in Pm method or in PP binding in application and in panels. For example the pMe.Pm method ("/data/#vars/Temperature/#ext/al") returns the data binding with al identifier (ExtAlarmAnalog) in the "Temperature" variable (Var) in the "data" object (PmData).