      TOS can be used to "see" block trades, which do not show up on theLevel II screen. Block trades by themselves sometimes mean nothing. Manytimes they are a one-time occurrence and will have no effect on the priceof the stock. However, if a number of block trades go off at or near thesame price, they are a clear indication of large buying or selling interestin the stock. If a number of block trades occur below the bid, it isclearly selling pressure. If a number of block trades occur above the ask,it is clearly buying pressure.