On Fri, 17 Aug 2012, Jukka K. Korpela wrote:

> There is an essential difference between using combining mark
> and using a precomposed character:
> ...
> In searches, for example, they do not match.

At least in Google, they match:
http://webcache.googleusercontent.com/search?hl=en&q=cache:www.alanflavell.org.uk/unicode/unidata03.html+%C3%80

> In rendering, they would normally produce the same result,
> but not necessary; transferred to another program, they might
> produce different results, if the program cannot handle
> combining marks or handles them too simply.

Especially monospaced fonts such as Courier (New) are likely
to fail. Test page for combining marks:
 http://www.user.uni-hannover.de/nhtcapri/combining-marks.html

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