For connections and communication between the database server and the client, the runtime library of the interface programs (such as the precompiler and ODBC) must be installed on the client.
You can update this part of the client software. So that you can continue to use and administer any older applications, the various versions of the runtime library of the interface programs are installed in different directories. The registrations in the system perform these installations automatically.
IRCONF is a tool that you can use to register and display the installed versions of the runtime library of the interface programs at a later time. You do this by entering commands at the operating system level, with your choice of options.