How to find the list of transaction code based on a field ?

Hi Gurus

I have a unique requirement.We are adding a new field into our system and want to know which all t-code contains that field ? So that we can update the user training manual. Can some one tell me the ways and means of finding the list of all the t-code ( or where used e.g functional area ) based on " a field" ?

Thanks in advance

SN