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In page NeWS:

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Compared to X, NeWS was vastly more powerful,[citation needed] but also slower (especially for local connections). The C API was very low level and difficult to use, so most NeWS programs tended to be entirely written in PostScript.[citation needed] Another factor in the popularity was that Sun charged a fee to license the NeWS source code, while the MIT X11 code was free of cost.