SPOP Registration

[Popy]

hello all,
what does the registration of SPOP means?
what is happening exactly while registration?
can I register same SPOP more than once?
What is content information that get after registering SPOP,the downloading is a must to do activity in SPOP???
If nslookup is not working will iy be a problem for SPOP to contact hp backend ?
Please help me,
Thanks In advance
Raneesh Vijayan