This command copies the current puzzle givens into the system memory buffer. These values can be retrieved using the Paste command.
Cells without a given are copied as 0, and solutions, possibilities, and all information entered in solve mode will not be copied. All 81 givens (including the 0's) are strung together in one line. Thus, the information in the buffer will look like this:
Try it for yourself. Highlight the values above, then press CTRL+C, and use the paste option in Sudoku Snake. A 'Very Hard' puzzle should appear.
This information should be pastable in most other (inferior) Sudoku programs.