Users in systems

Question: Hello there,

I was told that there is a transaction that tells you what clients a user has an ID in.

i.e. User 'TESTER' is in DEV 010, 020, 040.

Is this true? If so, what t-code is that?

Thanks


Answer:
A pull-down report in tcode USMM

Answer:
Thank you oh GURU one.