finding tables used for all modules t code

hi Gurus

I just come accross to one answer that enter T.Code se49 & in that screen enter the T.Codes you want to see teh tables used for that t code.

But when i enter t code se49 the system says it does not exists.

Does it have any varsion problem ? I m working on ECC 6.0

Please let me know if any t code is there for the same.

Thanking u

Santosh Rothe