* Registers:: How registers are implemented. Accessing
the text or position stored in a register.
* Base 64:: Conversion to or from base 64 encoding.
-* Checksum/Hash:: Computing "message digests"/"checksums"/"hashes".
+* Checksum/Hash:: Computing cryptographic hashes.
+* Parsing HTML/XML:: Parsing HTML and XML.
* Atomic Changes:: Installing several buffer changes "atomically".
* Change Hooks:: Supplying functions to be run when text is changed.