Answer: CTRL

Ctrl is short for "Control" key. It is a function key found on computer keyboards, typically located in the bottom left or bottom right corner of the keyboard. When pressed in combination with another key, such as A, C, or V, it performs a specific action or command. The clue "Shift neighbor" implies that the Ctrl key is located next to the Shift key on the keyboard.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: PC shortcut key. Explanations are generated by AI and may be inaccurate.