There's two official desktop clients. One called "Telegram" and the other called "Telegram Desktop". Both are regularly updated etc. The regular "Telegram" ha

There's two official desktop clients. One called "Telegram" and the other called "Telegram Desktop". Both are regularly updated etc. The regular "Telegram" has secret chat. It is tied to device, but you can do desktop -> phone or desktop -> desktop or phone -> desktop specifically, but that depends on a bit of coordination.. but yeah definitely not synced between each combination