Hi sir Mauricio (aka Mauricio Fernández [mailto:batsman.geo@yahoo.com]):
You expounded last Wednesday, December 18, 2002 6:12 PM:
…
You can write it yourself:
cool quick code -like batsman 
I’ve archived this quick hack in my ruby arc…
batsman@tux-chan:/tmp$ cat b.rb
module Kernel
def safe(level, &block)
thread = Thread.new {
$SAFE = 4
minor correction ^^^^^^^ $SAFE = level
kind regards -botp