1. Visit: http://docs.unity3d.com/412/Documentation/ScriptReference/MonoCompatibility.html
2. Wait for the page to load. It's very very very long.
3. Search for "Class: Process"
4. Observe a list of all the members that are supported.
5. Scroll down and see `StandardInput` has webplayer in red meaning that this member is not supported on webplayer.
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