When I use Yahoo Finance graph, I can see like many other graphs available out there, there is a 'volume' chart at the bottom of the graph.
For example for stock XYZ, at a given graph point it shows (say) $3.94 and the corresponding volume shows (say) 45,000.
What I want to know if the volume is total of sellers AND buyers OR sellers only OR Buyers only?
How would I know or find volume of buyers or sellers on the these free graph pages. Same applies to Comsecc.