Ghosting inappropriate buttons  by Joe Gillespie — Dec 1, 2001
In this example, the current page is, quite logically, removed
from the range of choices of pages that you can go to by
'ghosting' the link button. This mechanism requires that the
destination page is clearly titled elsewhere using static text.
Another way is to make the HOME button become the actual place
name instead of a pointer to it. That is a fairly subtle
distinction but many interface design mechanisms are subtle. In
real life, you can fence-off an area of ground to keep people
from straying onto it or you can simply pave the area with sharp
stones. This is using 'visual communication' instead of brute-
force, physical barriers.  Many navigational systems use another
real-world metaphor, the radio button. The mechanical buttons on
old car radios were used to tune into preset stations. One was
always pressed in, the others remained out. When you press
another button, it goes in and the previously selected one pops
out. This was known as a