Edited records in TMG to be updated with userid of who are editing.

this might be small problem for you:

I have 2 step table maintenance generator.

there is one column called "Changed By"..

When ever user tried to edit few records in table maintenance generator,

and saves... those records to be updated by his userid under "Changed by" column

So My question is where and how can i trace those particular records got edited or where

can I write coding for this to updated along with userids in that respective column ?

YOUR HELP IS HIGHLY APPRECIATED.

THANKS IN ADVANCE.