heavy wizardry

heavy wizardry n.  Code or designs that trade on a
   particularly intimate knowledge or experience of a particular
   operating system or language or complex application interface.
   Distinguished from {deep magic}, which trades more on arcane
   *theoretical* knowledge.  Writing device drivers is heavy
   wizardry; so is interfacing to {X} (sense 2) without a toolkit.
   Esp. found in source-code comments of the form "Heavy wizardry
   begins here".  Compare {voodoo programming}.