Alternatively known as Control 6 and C-6, Ctrl+6 is a shortcut key most often used to switch to the sixth tab in a browser or another program with tab support.
How to use the Ctrl+6 shortcut key
The "1" used with this shortcut is the "6" at the top of the keyboard and not on the numeric keypad.
Ctrl+6 in Microsoft Excel
Using Ctrl+6 in an Internet browser
If you five tabs open, pressing Ctrl+6 does nothing.
Related keyboard shortcuts
Below are links to related keyboard key and keyboard shortcut pages.