How can i get a reference of Client in multicast?

if i make multicast function, in this function it automatically sets “this pointer” as caller.

but is there any way i can get a reference of target of that multicast?.

like

  1. Client1 calls multicast function

  2. Client2,3 have to deal with that multicast function ( “this pointer” pointing Client1 here, how can i get Client2,3 here?)