Is it possible to check if a protocol (ex.ymsr:) is registered on a client's browser?
Title pretty much sums my question. I want to know just in case so I can switch between the protocol link, or the web link (such as for instant messengers) depending on if it's recognized by the client. This would be useful for someone who has a Yahoo!, AIM, etc. account, but does not have it installed on the particular computer he or she is on at that moment.