mirror how to send data to specific client?

this seems old and it says 'NetworkServer' does not contain a definition for 'SendToClient'
and this that unity suggest as answer is also old

so I’m trying to figure out how to send data to specific player like inventory box that player picks it up and that no other clients don’t get that message or has to check it out.

found: mirror gitbook it all explains there and attributes hope someone will find this useful as I was searching like mad for this