Type a page name and press Enter. You'll jump to the page if it exists, or you can create it if it doesn't.
To create a page in a module other than Interfaces, prefix the name with the module name and a period.
To get a thumbnail for a shell item, simply cast the IShellItem instance to IShellItemImageFactory and call GetImage() on it. Usage may look something like this:
IShellItem ppsi = null;
IntPtr hbitmap = IntPtr.Zero;
// GUID of IShellItem.
Guid uuid = new Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe");
SHCreateItemFromParsingName(filename, IntPtr.Zero, uuid, out ppsi);
((IShellItemImageFactory)ppsi).GetImage(new SIZE(256, 256), 0x0, out hbitmap);
Flags for the IShellItemImageFactory::GetImage method.