I've always been confused by this as well....but have always used "HHonors". At my last stay, the desk clerk specifically stated that to access wifi to go through "ATTwifi", so that's what I did. This was an ES property, I believe. I am not sure what the difference is, except for HHonors you use your membership number and PIN and for ATTwifi you use a code they give you at the desk....at least to the best of my recollection that is how it works.