Imagine you have made a software packackage,
  including some programs, for example one for listing all tasks of the
  system, and another for showing which tasks that requires most CPU
  time. And some other programs that has other functions...

  How would this be for the user? Well... He could click himself to
  the drawer containing these programs every time he needed them. But
  when he had done that a couple of times, he would probably put
  some (or all) of the programs in his launching tool. For example
  as a sub-menu in toolsdeamon.

  Let's make it more easy for the user, so that he won't need to include
  all the different programs, one by one, in his launching tool.
  With Selector, you can ship a little nice button panel with
  your software, and the user will only need to add one item to his
  launching tool.