questions about plasmoidviewer

[Tsiapaliwkas Giorgos]

hello,

i was looking at the plasmoidviewer and i couldn't understand 2 of its 
options.

-The location constraint to start the Containment with (floating, desktop, 
fullscreen, top, bottom, left, right) [floating]

-The formfactor to use (horizontal, vertical, mediacenter or planar) [planar]

can u explain that to me?

Also,i gave "plasmoidviewer desktop" but i couldn't add any widgets.Did i do 
something wrong or plasmoidviewer doesn't support something like this..

thanks in advance