pegasus user name

[Vivek Mangal]

Hello ALL,

I am working on RHEL 4.2
Today, when i saw /etc/passwd  file then

i saw a pegasus user in the file which have GID 500.
(pegasus:x:100:500:tog-pegasus PoenPegasus WBEM/CIM
services:/vsr/lib/Pegasus:/sbin/nologin)
can u tell me what the uses of this account ?
And if its a system user then why it take GID 500 ?
and i hav no user which hav 500 UID / GID ?

one more thing
pppuse have 1001:1001 GID and PID
(pppuser:x:1001:1001:,,,:/home/pppuser:/usr/sbin/ppplogin)
and nfsnobody hav 4294967294:4294967294 GID and PID
(nfsnobody:x:4294967294:4294967294:Anonymous NFS
User:/var/lib/nfs:/sbin/nologin)
Both user are system user then why they take more then 500 GID / UID  ?

Please tell me the reason