Check Installed Compoments

select * from product_component_version

http://stackoverflow.com/questions/7800027/how-do-i-load-os-variables-into-pl-sql

select * from user_errors

Run OS command from PL/SQL: http://www.toadworld.com/Blogs/tabid/67/EntryId/356/Run-an-OS-command-from-within-PL-SQL.aspx