WPC Standard Layouts

Hi,

I am trying to adjust the WPC standard layouts and having some issues.

Please can someone help.

I would like to know what the HTML file that is included in the deployment delivers?

I have also created a layout with three column, by adjusting the two colum layout, but it appears that none of my middle column is appearing in the page layout.

I have checked the portalapps.xml and this has all the relevant information.

Can someone clarify what the following lines are and what they refer to? (Is this something I need to populate somewhere)

<sdn:container id="rightcolumn1" />

Also if someone can clarify also where the style sheets are stored for ?

wpcclearfix

I will reward points.