I implemented a lite dns server (proxy in mind) and

Question

I implemented a lite dns server (proxy in mind) and

bind it on INADDR_ANY port 53, with an empty resolv.conf all of them comes to me. now xterm (and lots of other programs in other forms and amount of tries) sends 4 packets from 127.0.0.1 and there is no response, one packet contains my hostname+domainname and the other one just contains my hostname, and again it sends those two each one twice.
-1- this in local address space is strange
0- why it should use dns server for my own useless domainname and also send my hostname with it from localaddr?
1- all 4 packets opcode are 0 which means all of them are standard query. now the question is that why the hell something should do dns query for my hosname? :[
all of these force me to think about misconfigurations. is there any localhost usage for dns which i must config somewhere?