- CellProlog:>expr evaluates expr for every ordinary kernel evaluation done in the cell, as initiated for example by or by Evaluate in Place.
- CellProlog is not evaluated for evaluations associated with Dynamic objects.
- The default setting is CellProlog->None.
- CellProlog is often set at a style or notebook level, rather than for individual cells.
Rules for temporarily setting $Post:
Introduced in 2007