(32) broken pipe

[Dave Viner <suppressed>]

hi all,

i'm seeing a lot of these messages in my error log:

(32)Broken pipe: core_output_filter: writing data to the network

sometimes it appears by itself, other times, it is paired with this  
message:
(104)Connection reset by peer: core_output_filter: writing data to  
the network

what does this error indicate?  does this mean that a user has  
clicked the stop button while the page is loading?

thanks
dave