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## 3 Advanced Features

`C-c M-C-h`
  (`ses-set-header-row`). The header line at the top of the SES window normally shows the column letter for each column. You can set it to show a copy of some row, such as a row of column titles, so that row will always be visible. Default is to set the current row as the header; use C-u to prompt for header row. Set the header to row 0 to show column letters again.
`[header-line mouse-3]`
  Pops up a menu to set the current row as the header, or revert to column letters.