Under normal circumstances the Page Viewer will be sent the ID of an Article to display.
Occasionaly however it may be sent the ID of an Archive so you need to tell the system which Article to display in it's place.
By setting this option to 'Yes', you are telling the system that whenever the Archive you have chosen above (in the 'Parent Archive' field) is sent to the Page Viewer, that it should display this Article instead.

This template provides all the common elements of a web page, such as navigation, as well as defining the structure of the page into which other templates will fit.

The contents of this template are placed into the 'Module' placeholder within the Skin you have chosen above.
This placeholder simply defines where the page's main content will be placed.

This content version will not become visible to the general public until the date you specify here.

This optional field allows you to label a version so you can quickly recognise it in the list above.