Здравствуйте, Pavel Anufrikov, Вы писали:

PA>Как правильно назвать эти половинки?

Stub (клиентская часть) и Skeleton (серверная часть).

См. например The Proxy Pattern:

...
Internally, the client's constructor creates a client-side remote proxy, which is commonly called a stub

и

...
Stubs use IPC mechanisms such as sockets to forward client requests to server-side remote proxies, which are commonly called skeletons