Is it possible to subscribe to object sets changes without using OSDK?

It is possible to use “https://www.palantir.com/docs/foundry/ontology-sdk/typescript-subscriptions/” to subscribe to changes in object sets with the TypeScript OSDK.

Is it possible to mimic this behavior outside of the SDK? What if I want to implement it in another language not supported by the SDK ? (e.g. C#)