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E.g. on the homepage there are 2 links to contact.htm and we want to know which link is used more often. So we could add contact.htm?name=xy to one of the links. Like that we can easily track which link is clicked how often.
Will this hurt the spidering (fewer pages spidered) or even the SERP? After all Google might consider this as dynamic page.
Maybe it will even be looked at as duplicate content if we have a link to contact.htm?name=xy on one page and to contact.htm?name=zz on another whereby the page it links to is always the same (the?name= parameter is ignored by the server but can be analysed in the logfiles).