Where is module 'thread'?

[Francisco Colaço]

I need to use lightweight threads on a application, and tried to
use 'threading'.  Unfortunately, it asks for a module 'thread' which I
cannot find.

  I use RedHat 5.2 Linux and python 1.5.1 (RPM release 5).  I wish to
keep the application able to run on MS Windows (at the least the client
side).

  Where can I find the module or is there another module I could use?

    Francisco

-- 
Francisco Miguel Pedroso Honório Colaço
  fcolaco at wolf.fis.uc.pt