jg; Thanks for this...it was purely speculation on my part, as I had seen this "theory/idea" posted in years gone by.  The key to your answer is "related account", which I wasn't aware of...one reason I threw in "just a guess"

One reason I brought this up, was that just after 3 I had seen alot of trades moving between RBC amd CIBC @ 1.20 that seemed to be minutes apart and not particularly uniform in size...as a lot of computer type trades seem to be.

Any rate...

Thanks again...

Bob