"Below" is a front end token that creates an UnderscriptBox and fills the base with a selection.

"CellContextDialog" is a front end token that opens the Cell Context dialog.

"CellGroup" is a front end token that groups selected cells.

"CellLabelsToTags" is a front end token that gives a selected cell a cell tag that is the same as its current input or output prompt.

"CellMerge" is a front end token that merges the selected cells into one cell.

"CellSplit" is a front end token that splits a cell into two or three cells.

"CellTagsEditDialog" is a front end token that opens the Edit Cell Tags dialog.

"CellUngroup" is a front end token that ungroups selected cells.

"ClearCellOptions" is a front end token that removes all explicit option settings for a cell.

"Clear" is a front end token that deletes a selection without copying it to the clipboard.