Can't remember those short cuts your children showed you on the computer? Here is a chart entitled the Essential Keyboard Shortcuts (grouped by type) that has the most commonly used computer shortcuts.
Lock iPAD screen & iPhone screen so kids stay within the app
How to lock iPAD or iPhone Screen, so Children Stay within the App You Want Them to? - No More Accidental App Deletion or Unwanted App Re-arrangement! -- very helpful iPhone iPad tips for parents and teachers.