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I am curious how the widget rendering is implemented in a Linux RDP client, such as Remmina, on a high level. If RDP protocol transmit semantics as much as possible rather than bitmaps, then the client side needs to translate the windows widgets API (the equivalent of GTK/Qt) calls into Linux native calls such as GTK/Qt calls. For example, draw a window frame with minimize/maximize buttons, etc. Is that how it's done in practice?

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