Can GPOADmin shows who is currently connected to GPOADmin console?
No, GPOADmin does not shows this information in current version.
We have created an enhancement request to add the ability for a GPOADmin administrator to be able to see the users connected to the GPOADmin server in the GPOADmin console. The enhancement request to be evaluated for inclusion in a future version of GPOADmin is 574286.