Just a note about the process: today my main PC is running FireFox extremely slowly. This is being entered on Internet Explorer, while I simultaneously tried updating another one of my sites using my emergency spare computer. Sorry for being distracted!
As always, I also promote my article in DeHaan Services ("Introducing Discrete Probability Functions") and in my Xanga blog ("Do You Want Discrete Probability Functions?"). Neither adds much to this discussion.
First, ensure you can use a spare computer if there is a problem with your main one.
Second, ensure you have secondary software in case of a problem with your favourite program.