DYO: Volumes at the Bid and the Ask example

Q:  I am not asking for someone to write the DYO for me :) but mainly to tell me if this DYO is feasible.  Feasible as in, does the Volume variable shows the volume for the whole bar/period or does it shows the volume for the last trade?  If it shows the volume for the whole period or the whole bar, would it be possible in your next release to add a volume variable that will reflect the volume of the last trade?  Again what I am aiming it is to find how many people buy/sell using market orders for each bar.