In Keychat, you can set an ID to be only a Chat ID, only a Browser ID, or both a Chat ID and a Browser ID. Currently, if you log in to Keychat with your microblog ID and set it as your Chat ID, you can receive Nostr DMs (nip4 or nip17) in Keychat when someone sends them to you. However, Keychat does not support replying to messages via nip4. We are still considering how to improve this.