Using the webcam is easy, just a matter of a few API calls. Here's an example I found that should help you out:
http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=28493&lngWId=1
I've never worked with the LPT port before, but here are some examples for that:
http://www.planetsourcecode.com/vb/scripts/BrowseCategoryOrSearchResults.asp?blnWorldDropDownUsed=TRUE&txtMaxNumberOfEntriesPerPage=10&blnResetAllVariables=TRUE&optSort=Alphabetical&txtCriteria=LPT+port&lngWId=1&B1=Quick+Search
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