How to share object state between servers?

Question

C++ / C#

Good afternoon
Given: one shared object that stores state.
Task: Be able to share this state between servers. Be able to change / read the state + subscribe to state changes.
Something like a cross-server singleton with the ability to subscribe to events.
In my case, this is a limited number of connections to 1 equipment, which are used by a variable number of handlers.
Please tell me how to solve this problem

Answer 1

because there are no requirements for the solution (platform / scalability / complexity / limitations), then here is the simplest answer: .NET Remoting
Publish an object, add methods / events to it and connect and subscribe to events.