/d[y]oop loop/ (also "dupe loop") [FidoNet] An infinite stream

of duplicated, near-identical messages on a FidoNet echo,

the only difference being unique or mangled identification

information applied by a faulty or incorrectly configured

system or network gateway, thus rendering dup killers

ineffective. If such a duplicate message eventually reaches a

system through which it has already passed (with the original

identification information), all systems passed on the way

back to that system are said to be involved in a dup loop.