ShowSelection is an option for Cell which specifies whether to show the current selection highlighted.
ShowSelection is often set for styles of cells or whole notebooks instead of individual cells.
Settings for ShowSelection affect only how the selection is displayed, not where it is or how it works.
Setting ShowSelection->False is convenient if you want notebook operations to be performed invisibly.
See Section 2.11.13.
See also: Selectable.
New in Version 4.