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+Ruby/Tk does NOT support forking the process on which Tk interpreter
+is running (unless NEVER control Tk interpreter under the forked child 
+process). In the library 'tk.rb', a Tk interpreter is initialized. 
+Therefore, if you want running Tk under a child process, please call
+"require 'tk'" in the child process. 
+
+For example, the following sample1 will NOT work, and sample2 will
+work properly.
+
+---<sample1: NOT work>---------------------------------------
+require 'tk'  ## init Tk interpreter under parent process
+
+exit! if fork ## exit parent process
+
+## child process
+TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
+Tk.mainloop
+-------------------------------------------------------------
+
+---<sample2: will work>--------------------------------------
+exit! if fork ## exit main process
+
+## child process
+require 'tk'  ## init Tk interpreter under child process
+TkButton.new(:text=>'QUIT', :command=>proc{exit}).pack
+Tk.mainloop
+-------------------------------------------------------------
+
+                                         2004/04/20  Hidetoshi NAGAI