Writtenwyrdd gives some thoughts on researching military tactics and strategy for writing.
Some discussion of how ISAPI filters work with more details about where Unicode can be used.
Remember that Windows XP only has IIS 5.1 which doesn't handle the
UNICODE_ prefix at all. Personally I've not tried IIS 7.0 (ships with Vista) yet, but I ought to test compatibility of the filters that do all the clever stuff in FOST.3™ (i.e. the ones that run this site).