Undocumented feature...

[tree@lady.blindchicken.com (Larry Tyree)]

Well, perhaps I am ready to let this one out of the bag.  However, don't
try it unless your wife agrees or you are already sleeping in the shack
(or the doghouse).

Create a file called N6TR160.CTY which has a list of the prefix ID's
that you have confirmed on 160.  Then stay logged into your packet
cluster overnight.  

73 Tree 
tree@contesting.com

PS: This hasn't actually helped me work one country yet, but maybe it
might help you.