TileLabels is a library that let you put signs in a scenario and then access the location of those tiles by their name. This library removes all the signs and keep them in memory for you so that players won't see them.
The library supports (and encourages) a prefix for these special signs. Signs that doesn't contain this prefix will be untouched.
Forum thread: http://www.tt-forums.net/viewtopic.php?f=65&t=58573