You can download lvwutil32.zip from
http://zone.ni.com/devzone/devzoneweb.nsf/opendoc?openagent&74DDE683A1AFF6988625683A000C0D73&cat=034E59A8530E09DF862568900018707A
Once you have unzipped the file you will have a couple of libraries and some documentation.
Inside winutil.llb you will find 'Make Window Always on Top.vi' which I suppose is what you are looking for (I haven't tried though).
Hope this helps
Roberto
