Date: 8 Feb 2002 20:31:08 -0400
 There are books, and there's code to download.
 First, the books:
 * Ray Duncan's {Advanced MS-DOS}, ISBN 1-55615-157-8, gives a brief
 checklist intended for experienced programmers. The ISBN is for the
 second edition, through DOS 4; but check to see whether the DOS 6
 version is available yet.
 * {DOS 5: A Developer's Guide} by Al Williams, ISBN 1-55851-177-6, goes
 into a little more detail, 90 pages worth!
 * Pascal programmers might look at {The Ultimate DOS Programmer's
 Manual} by John Mueller and Wallace Wang, ISBN 0-8306-3534-3, for an
 extended example in mixed Pascal and assembler.
 * For a pure assembler treatment, check Steven Holzner's {Advanced
 Assembly Language}, ISBN 0-13-663014-6. He has a book with the same
 title out from Brady Press, but it's about half as long as this one.
 Next, the code. Some of it is companion code to published articles,
 which are also listed below:
 * John English (<http://www.it.bton.ac.uk/staff/je/>) has created a
 wonderful C++ class for creating TSRs which includes several examples.
 This one is my personal favorite. It is downloadable as:
 <ftp://ftp.brighton.ac.uk/pub/je/tsr100je.zip>
 <http://www.simtel.net/pub/pd/42697.html>
 * The Alternate Multiplex Interrupt Specification (AMIS),downloadable
 as: <http://www.simtel.net/pub/pd/46788.html>
 <ftp://garbo.uwasa.fi/pc/programming/altmpx35.zip>
 * Ralf Brown's assembly-language implementation of the AMIS spec, with
 utilities in C, is downloadable as:
 <ftp://garbo.uwasa.fi/pc/c-lang/amisl092.zip>
 * Douglas Boling's MASM template for a TSR is downloadable as:
 <http://www.simtel.net/pub/pd/40314.html>
 * Code for Al Stevens's "Writing Terminate-and-Stay-Resident Programs",
 Computer Language, February 1988, pages 37-48 and March 1988, pages
 67-76 is downloadable as: <http://www.simtel.net/pub/pd/41812.html>
 Finally, there are (were?) commercial products, of which TesSeRact (for
 C-language TSRs) is one of the best known.