As below: 12> A = "abc". "abc" 13> <<A, "CDE">>. ** exception error: bad argument 14> <<"abc", "CDE">>. <<"abcCDE">> Any idea? Regards Andy -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://erlang.org/pipermail/erlang-questions/attachments/20110803/a92c1465/attachment.htm>