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based on an earlier version of the Wolfram Language.
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 Documentation / Mathematica / Other Information / Menu Commands / Special NeXT Menus / Notebook Menu  /

▪ Save writes out the currently selected notebook.
▪ Use Save to record changes made to a notebook already stored on disk. If the current notebook is still untitled (not yet saved on disk), Save behaves exactly like Save As and asks you to name it.
▪ Keyboard shortcuts: s ; s s