indirect jump

    A jump via an indirect address, i.e. the
   jump instruction contains the address of a memory location
   that contains the address of the next instruction to execute.

   The location containing the address to jump to is sometimes
   called a vector.

   Indirect jumps make normal code hard to understand because the
   jump target is a run-time property of the program that depends
   on the execution history.  They are useful for, e.g. allowing
   user code to replace operating system code or setting up
   event handlers.

   (2010-01-01)