no compatibility issues exist. both work individually and both will work together. the only thing to remember is that if you are using the wep or wpa keys, on a MAC you use lower-case letters but on a Windows computer you use capital letters in the password\code.
I'm sorry, but I do not agree with the Windows key information (highlighted above), because I think most people will want to enter the WPA pre-shared key using ASCII, not hex.
I use WPA on my network, have for years, and I always use a mixture of uppercase, lowercase, numbers, and special characters for the WPA pre-shared key. That, along with using a long key, will make the connection the most secure.
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