Extra messages on my console.

Hi All,

I'm getting a lot of this sort of thing in my console when postgresql is 
being contacted

message type 0x54 arrived from server while idle
message type 0x44 arrived from server while idle
message type 0x43 arrived from server while idle
message type 0x5a arrived from server while idle
I'm trying to compile PostGRESql 7.4.17 on a HPUX PA box.

Any idea what those messages are and why they are comming. It would be of 
great help.

Regards
Rajaram J