viewport width and viewport origin concept issue of deep zoom

Question

Hello everyone,

I am new and learning Deep Zoom. I am learning from here and have two basic deep zoom concept issues dealing with viewport width and viewport origin.

http://blogs.msdn.com/silverlight_sdk/archive/2008/11/18/using-viewportorigin-and-viewportwidth-in-deep-zoom.aspx

My two quesitons are,

1. When viewport width of an image is 1 and viewport origin is (0, 0), it means the specific image will occupy the whole MultiScaleImage area?

2. As mentioned here -- "For ViewportOrigin, the value specifies where the corner of the viewport should be relative to the corner of the image.", I am confused about what means viewport. I think viewport means the whole MultiScaleImage area, is that understanding correct?

thanks in advance, George