title: How to determine ORACLE_HOME from PL/SQL?
body: <p>Is it possible to determine where Oracle is installed using pure PL/SQL?</p>
  
  <p>Use case:
  In order to call an external C library, I need to know its exact path (for the <code>create library</code> call). My DLL will reside in Oracle's BIN directory, but I can't hard-code the path of the DB installation in my scripts...</p>