The package takes control of the six TeX token registers \everypar, \everymath, \everydisplay, \everyhbox, \everyvbox and \everycr. Real hooks for each of the registers may be installed using a stack like interface. For backwards compatibility, each of the \everyX token lists can be set without interfering with the hooks.

The author is Stephen Checkoway. The package is Copyright © 2010 Stephen Checkoway.