Livecode Server version (wrt. on-rev)

[Alex Tweedly]

I'm using on-rev (specifically loki.on-rev.com) for my website. It is 
(to my surprise) still using 4.6.4 of LCserver.

Is there any way in the script (or anywhere else) to tell it to use a 
5.0 version ?
Or any other way to do the equivalent of "start session", "stop 
session", etc. ?

Thanks,
-- Alex.