how to find the program name and screen no. for a field

Hi experts,

Plz tell me how to find the "Program Name" and "Screen No." for a field.

I saw somewhere it is written like this:

For eg:

For field, "MARA-MATNR" the "Prog Name" = "SAPLMGMM"

and "Screen No" = "4000".

Thanks for the help.