About tracking and about site content copy

Hi,

I have an affiliate marketing tracking software (finding out what sales are made on the landing pages, what users and from where are they referred from) done by a programmer for me.

I wonder if:

1) Is there any way to copy contents from other website besides using
file_get_contents or CURL?
The problem for file_get_contents is that some hosting doesn't allow
this function.
CURL works better but sometime is unstable and does not fetch
the content properly.

Is there a better solution for scraping of fetching content from other
website?

2) Is there any way to retrieve tracking ID without self redirection?
The software I have has an area called Rapid Test.
Rapid test does this with self redirect, but I don't want that.
Rapid test tracking code does this

a) get the referrer URL
b) redirect to the software tracking link that look something like
http://www.thesoftware.com/go.php?uid=1&cid=1&referrer =$referrer&softwareflag=1

This is where tracking takes place, it also assigns softwareID,
and it redirects back to "Landing Page URL" and passes softwareID to it.

This process is good but is there any way to track and get softwareID
without redirection?

I have another test called multiple-page test.
My multi-page test with javascript code can do this but can't retrieve softwareID.

Would this be possible using ajax?