Optionally specify the customization directory of XMLmind XSL Server

This step allows to specify customizeDir, which is the most useful server parameter.
Each time you'll upgrade XMLmind XSL Server, you'll have to reconfigure it using controlapp. When you'll do this, always specify your existing customization directory during this configuration step.
It should be very quick and safe to do so because in principle, controlapp remembers everything you have specified during the last configuration session.