$P0000EN is a standard available within your SAP system (depending on your version and release level). Below is the basic information available for this SAP report including which OBJECTS it interacts with such as TABLES, FUNCTION MODULES, INCLUDES ETC. Also check out the submitted Comments related to this SAP report or see any standard documentation available.
This report can be called from another progam/report simply by using the ABAP SUBMIT statement, see below for example ABAP code snipts of how to do this.
No INCLUDES are used within this REPORT code!
No SAP DATABASE tables are accessed within this REPORT code!
No SAP FUNCTION MODULES are executed within this report code!
Although this basic information may have limited use it does provide an easy to find location to store any knowledge about this program/report.