Using continuosly running threads in clustered environment

Hi,

Am realatively new to a clustered environment and am trying to port my
application from a non clustered env...
My application has continuous threads which starts up on the start of the
application, but I need only one instance of my threads running while deploying
on a clustered environment....in case I have a backup server on which my app is
deployed as a failover mechanism...

I know a few ways to do it as a part of coding in my app itself....but am
looking for some sort of an industry standard on this........it is a plain web
application and I will need only session state persistence as a part of the
failover.....


Please do post in case any more info is needed..
Thanks in Advance