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To edit a cell in the spreadsheet, move your mouse pointer over it until you are able to follow a link. Click on the link to open up an editing window. The current contents of the cell will be shown and can be modified. Pressing the

Accept
button will cause the spreadsheet to be updated with the new formula. You will then be working with an unsaved modified copy of a spreadsheet. See Spreadsheet Files Help for information on loading and saving spreadsheets. Pressing the
Discard Changes
button will discard any changes you have made to the contents of the cell.

What goes in a cell

The cells of the spreadsheet contain a mixture of Perl commands and LON-CAPA specific functions (Help). Most non-IO Perl functions work in cells.