In researching, say, "hotdog software" and "hot dog software,"
slightly different results will crop up, but, mostly, you will
find the same site, http://www.hotdog-software.com . Therefore,
it can be said that the results vary, but some SEs and
Directories do seem to "add" the hyphenated words, which is the
general underlying Theory. Caveat: that is, if I understand your