Hi Alex,
SetPosition is used for positioning objects in 3D space. SetEuler is used to rotate objects in 3D space. I don't know if that was your full question. Otherwise, please explain your question in more detail. Because you are new to Vizard, I would advise you to read the Vizard teacher in a book which you can download at:
http://www.worldviz.com/support/download.
Frank