Can MM's buy and sell to themself? If so, isn't this 'artificial volume' and 'artificial price movement', and occurs during slow periods, correct? If this occurs, how can one be sure of any 'true' price / volume / pattern / day's average trading volume? What internal and external regulating factors affect mm behavior? and finally, If we can 'see' mm's via Level II (not that I use it), is the opposite possible for mm's to identify a traders 'potential to make a trade' and see the opposite direction back to a traders platform via the point and click pipeline electronics? Thanks for any insight.