...to Source code section, Pocket PC Samples...
1) GPS - displays the current GPS location:
http://www.smorgasbordet.com/pellesc/sample_gps.htm
2) VertexCE - DirectX demonstration:
http://www.smorgasbordet.com/pellesc/sample_vertexce.htm
3) UniqueID - really unique device ID:
http://www.smorgasbordet.com/pellesc/sample_uniqueid.htm