I'm currently using HLEbroking for my trading on the KLSE.

Those who use any of these online trading services would know that we can see the number of trades and shares executed for each price at each instance. For a sell transaction it would be naturally RED and a buy transaction GREEN.

My question is, how does the system determine whether a transaction should be RED or GREEN?

For example, for every queued SELL order to be executed, there must be an opposite BUY order, only then these 2 orders will be matched then it's considered a transaction.

In that case, how does the system qualify whether this transaction was a SELL or BUY? Shouldn't it be neutral or JUST a transaction?

It may seem a dumb and irrelevant question but I think it matters because I think this more or less gauges the selling/buying pressure for a stock, besides viewing the queued order quantity.

So any ideas?