what are the new DVI-PS Options in LyX preferences for?

[Uwe Stöhr]

While updating the UserGuide I noticed a new preferences setting under 
Outputs->General

"DVI-PS Options"
What feature of LyX is using this and where can I find a list of 
possible options?

This new feature should be added to
http://wiki.lyx.org/LyX/NewInLyX22
if possible.

thanks and regards
Uwe