[newbie] What's the ld-linux.so.2?

[yue . m . ma]

Hi there,
Some time when I closed the Netscape browser 4.7, I found there was a process:
ld-linux.so.2 (or some other name like that, I don't remember clearly), I can
not kill it by using the kill <pid>, but itconsumed a lot of machine resources
like the CPU time, memor.. it was on top of the "top" output.
I tried relogin to X, but it doesn't work, I have to restart the computer to
kill that process.

Any suggestions?

Thanks!