2

If I have Contract A deployed to the Rinkeby Test Netwok
If I have Contract B deployed to the Kovan Test Netwok

Then, can we program the contracts to interact with each other like Contract A invoking the Contract B methods?

3

To communicate between two different networks, you need a bridge of some sorts. The most straightforward bridge is an oracle service which relies data between the chains.

To create a decentralized bridge is very difficult. Basically you need decentralized oracles (something similar to Chainlink) and a decentralized backend system which relies the data. The most difficult part is probably the decentralized backend system, especially if it needs to be trustless.

In short: I don't think it's fully possible, and some compromises need to be made.

1

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