A single frame type] Reduces the number of command contexts. Having a single frame type encouraged us to develop a single editor that could operate on all types of objects in a frame. Furthermore, we merged navigation with editing, providing a single major command context in which all commonly used commands are directly available to the user. In fact, we no longer describe KMS as having an editor. Having one frame type and one major command context greatly simplifies the user's model of the system.
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