Getting the main program or tcode from child tcode

Hi

I execute a tcode1 . And while in that tcode1, I select the sub menu in the help menu. This sub menu is a custom one with a tcode2. Tcode2 calls a program. I would like to get tcode1 when I am in this progam. Somehow i get only Tcode2. Is there a way to get tcode1 which is the main tcode ?

Thanks

Bindu