How to determine local client using HLAPI?

If I’m reading the documentation correctly, the HLAPI creates a server on the host as well as a local client on the host. The rest of the clients are then connected through the network. How can I, in code, determine if the client my script is attached to is the local client (as I want my local client to have authorities that the networked clients don’t have)?

both isServer and isClient will be true in a host.
both OnStartServer and OnStartClient will be invoked.

Thanks! It seems counter-intuitive that this information would be derived by a combination of flags. Oh, well…