In this chapter we document some of the libraries from the
<pcehome>/prolog/lib XPCE/Prolog
library. The libraries described here are only the commonly used ones.
For more information check the file Overview in the library
directory and the source-code of the library.
library(help_message) registers balloon-text with
graphical objects.
library(broadcast) library is a
pure-Prolog library sending messages around in your application. It is
especially useful for blackboard-like architectures.