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Tabbing navigation should not be confused with tabbed document interface The order of focusing can be determined implicitly (based on physical order) or explicitly (based on tab index). — “Tabbing navigation - Wikipedia, the free encyclopedia”, en.wikipedia.org
Initially these were set by hand but later tab set and tab clear keys were added. These were set to correspond to the particular column locations of the table, hence tab, being worked on. — “Tab key - Wikipedia, the free encyclopedia”, en.wikipedia.org
Alt-Tab. From Wikipedia, the free encyclopedia. Jump to: navigation, search. Alt-Tab is the common name for a keyboard shortcut on Microsoft Windows Windows 3.0 onwards used for switching between top-level windows without using the mouse; hence it was named Task Switcher (Flip in Windows Vista). — “Alt-Tab - Wikipedia, the free encyclopedia”, en.wikipedia.org