"Running Stops"

["WNk" <wnw@xxxxxxxxxxxxxxxx>]

I apologize if anyone has responded to the following;
if they have, I have missed it. Here is a repost:

I am a new subscriber to this list;
 I've read several postings of late dealing with "running stops".
Would someone be so kind as to explain in detail
exactly what this process is? 
-What is the motivation of the floor trader?
-How is it accomplished?
-How does the floor trader profit from it?
-What can be done (if anything) to lessen the possibility
 of your own stops being run?

Any comments are welcome.
Thanks in advance.
wnw@xxxxxxxxxxxxxxxx