KMSquote: empty space in KMS frames used for creating items, creating graphics, or invoking 'back' commands

Quotation

Spatial nature of KMS] Provides a natural command context. Since space in KMS is part of the data model, it provides a natural context for interaction. KMS uses this context for creating objects. When the cursor is in empty space, the user can directly create points, lines, rectangles and text items. The navigation command Back is also available. In many systems, user input in empty space is an error condition!   Google-1   Google-2

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KMStopic: use of space in user interface (6 items)