Hi,
these VI's have been locked (you can do this on your own VI's,
I gather an encryption technique technique is used
1,
2,
3,
4 ). That means that you are not able to modify the contents or 'see inside'. This is often done if there has been considerable effort put into the VI. Perhaps to protect the Intellectual Property (IP) or perhaps to protect the integrity of the code in the public domain. It can also be used to force / encourage use of modular coding. Sometimes it might just be be to hide a bit of messy code of course
(I make no judgement here). Of course you must remember in this instance that it is not
Open Source even though it is
freeware (Wikipedia).
However the overall structure looks straight forward and I don't think it will prevent you from doing just about anything you could think of. Think of the VI's just like native LabVIEW VI's. As long as you understand the function and have an example of how it's used, it should be straight forward to use them in your own application.
Links
http://forums.ni.com/ni/board/message?board.id=170&message.id=161139
http://sine.ni.com/apps/utf8/niepd_web_display.display_epd4?p_guid=B45EACE3E71756A4E034080020E74861
http://zone.ni.com/devzone/conceptd.nsf/webmain/5930593a46fe5e1b86257075007b9ddf
http://digital.ni.com/public.nsf/allkb/8a9c88569eed14a5862565bc006e591c
http://zone.ni.com/devzone/conceptd.nsf/webmain/3fe16102a6fab74986256acc0059cc76
http://zone.ni.com/devzone/conceptd.nsf/webmain/3fe16102a6fab74986256acc0059cc76
http://en.wikipedia.org/wiki/Freeware