Disco, I've seen this before. Here's one link explaining the "code". There may be others. I have no idea who came up with it first.

http://falconstocks.com/articles/readingmarketmakers.html

Frankly, I don't believe any of it and I'll bet you don't either. :>) These guys are in a highly competitive business. Why would any market maker help another market maker....unless it's his father or he's being blackmailed? :>)

I can't account for those 100 or 200 share prints that otherwise make no sense but I don't believe they're signals. I could be wrong. I've been wrong before.....once.