Settings Options using VLisp

[coopdetat]

I looked all over for how to set the default plot to file path and had not much success until I stumbled across this post:

http://forums.autodesk.com/t5/Visual-LISP-AutoLISP-and-General/vla-get-defaultplottofilepath/m-p/215...

With this information I was able to set the default plot to file path in the options dialog using only VLisp.

(VLA-PUT-DEFAULTPLOTOTFILEPATH o_prefs <new path>) o_prefs is defined in code below. 

I'm still crawling along in my uncderstanding of the object model and how to get at it.  Everything seems very difficult because I have no good reference of the available functions and how to use them.  I know many of you will see what I am so excited to have discovered as elementary, and I know it is, but that's where I am and I suspect there must be others like me, so, for them, here it is:

I discovered something regarding the options dialog that I thought might help others as well.  It sure will help me.  (the following code is from the above linked original post, I've added some notes):

  ;;make sure vl- functions work
  (VL-LOAD-COM)
  ;;get the acad application
  (SETQ acad (VLAX-GET-ACAD-OBJECT))
  ;;get the application preferences,
  (SETQ prefs (VLA-GET-PREFERENCES acad))
  ;;
  ;;HERE IS WHAT I THOUGHT MIGHT HELP SOMEBODY
  ;;
  ;;prefs object has the following properties which provide
  ;;access to the tabs in the Options Dialog:
               ;   Application (RO) = #<VLA-OBJECT ...>
               ;   Display (RO) = #<VLA-OBJECT ...>
               ;   Drafting (RO) = #<VLA-OBJECT ...>
               ;   Files (RO) = #<VLA-OBJECT ...>
               ;   OpenSave (RO) = #<VLA-OBJECT ...>
               ;   Output (RO) = #<VLA-OBJECT ...>
               ;   Profiles (RO) = #<VLA-OBJECT ...>
               ;   Selection (RO) = #<VLA-OBJECT ...>
               ;   System (RO) = #<VLA-OBJECT ...>
               ;   User (RO) = #<VLA-OBJECT ...>
  ;;get at the preferences on any of the tabs using
  ;;(VLA-GET-<name> <object>)
  ;;for example:
  (SETQ o_prefs (VLA-GET-OUTPUT prefs))
  ;;HTH someone