You would like to see the patch history of the system and you are running on Windows and SQL Server.
You can view the patch history for a DLL or EXEcutable (such as disp+work) by querying a table in the SQL Server database as follows (changing the <SID>):
SQL> select * from <SID>.MSSDWDLLS
order by DLLNAME, HOSTNAME, DLLPATH, LASTDATE, LASTTIME;
The results will provide a complete traceable history of the system including the previous identity of the SAP system, the different application instances and any inconsistencies in the DLL versions.