Hi

I'd loop over the PageData.Property.

            foreach(PropertyData objData in CurrentPage.Property)
            {
                var x = objData.Name;
                var y = objData.Value;
            }

Edit:

I see now that you might want to get the PageData object. Check the SDK for DataFactory.GetPage()

One easy way is to change the master page by overrirde the OnPreInit

protected override void OnPreInit(EventArgs e)
{
            if(Request["404"]!=null)
            {
                MasterPageFile = "/Custom/MasterPages/PageNotFound.master";
            }

    }

Then you can easy use the code Hernrik posted.

You could create a PagePlugIn and hook the PageBase.PageSetup event and then attach your code to every page request.

Check out Allan Thraens blogpost on how he does much the same thing, though rendering to PDF, but the same principle
would apply: http://labs.episerver.com/en/Blogs/Allan/Dates/112230/7/Output-EPiServer-Pages-as-PDF/

/johan