[Zope] 'showREQUEST' or 'show_REQUEST' ?

Jason Cunliffe wrote:

PS. Be warned: <8-() if you try put the code above in a DTML methods named 'showREQUEST' or 'show_REQUEST' it will not work = 'Id already in use'

That's a little weird... Can anyone shed any light on this? cheers, Chris