Report for Variants

Hi All,

I would like to know is there a standard report which gives display / screen / transaction variants created by users? What i need is a list which gives me details such as:

User logon name, display variant name (for query & report), transaction variant name, screen variant.

I would then like to mass change the user logon name with new logon names - is there any tool for this or can this be done using LSMW?

If no standard report exists, may i know from which tables i can get information of the variants created by users?

Await inputs.

Vivek