The bundle deals with category code switching; the packages of the bundle should work with any TeX format (with the support of the plainpkg package).

The bundle provides:
– stacklet.sty, which supports stacks that control the use of different catcodes;
– actcodes.sty, which deals with active characters; and – catchdq.sty, which provides a simple quotation character control mechanism.

The author is Uwe Lück. The package is Copyright © 2012 Uwe Lück.