This is the thing I *HATE HATE HATE* about applescript...how do you know what commands work for what application?!!
Unfortunately, the link you gave was for a PERL script ("control iTunes from Perl"...via applescript). "play" is a valid method in this perl module that then calls the appropriate iTunes applescript command.
The only way I know anything about the command is because I downloaded the iTunes Script Collection from
http://www.apple.com/applescript/itunes
Looking at the script entitled "Play Random Track", you can see that you have "track" variable/object somehow, and then use the "play" command followed by the variable:
tell playlist library
set this_track to first track
play this_track
(I hope this helps). But there *MUST* be some way of saying "play current track from current playlist" or "pause/resume current track". How do you get these commands for an individual application?
---gralem