Places where an userID is used

Hi Friends,

We are performing few system clean-ups in an existing SAP systems and I need an information before we delete any data on this.

Suppose if we get a request to delete an user in a client, is it possible we can check where these users are linked up ? Example like in which RFC or any background job is running under this username ? Do we have any specific transaction code or any SAP report to get this data ?

Any help is much appreciated.

Thanks and Regards,

Vimal