Whatever happened to C@?

When C# was first announced by Microsoft it reminded me, in name at least, of C@ (pronounced 'cat') produced (if my memory serves me correctly) by AT&T. It must be almost 20 years since I saw a whitepaper on it and my memory is quite sketchy. The main feature that I remember is that it was designed to be portable across multiple platforms. I occasionally get reminded of it and attempt to locate any information about it with a couple of quick searches which are probably being flumoxed by containing the '@' symbol. Clearly, it never took off as a language but I would love to get hold of that whitepaper again for old time's sake.