Mystery 'snoodles' in referral logs

Can anytone decipher these?

[larryhatch]

I can figure out most of the stuff in the lines of my access_log files,
but some entries leave me at a loss.

In Google referrals, I see the notation &sa=N or &sa=G.
What is "sa", and what does it mean if set to "N" or "G"? Is one better than the other?

Also in Google I find &meta=[nothing]. What is 'meta', and what good is it if set to NULL?
Another is &lr=[usually nothing]. What is 'lr'?

Frequently I find &rls= DELA or GWYA or GAPB or HPIA or GGLJ or GGLR or GGLI or a dozen others.
What is &rls, and what do those 4-letter values denote?

Over in Yahoo land, I find &fr=FP-tab-web-t and variations. What's that all about?
Then Yahoo adds &cop=[nothing]. Are the police watching?

Here and there, I find long strings like this:
"MSN 9.0;MSN 9.1; MSNbVZ02; MSNmen-us; MSNcOTH; MPLUS)"
.. with many other members and variations. What's that all about?

I understand browser indications like MSIE 6.0; Windows NT 5.1;
But, what is "SV1;"? Extrememly common, but I never heard of it
Same goes for '.NET CLR 1.1.4322;' and variations.
Just who or what is .NET CLR?

My Access_logs are three times the length needed for me so study my traffic.
I'd at least like to know why.

Sorry for all the dumb questions. -Larry

[Dijkgraaf]

Well lr= is language from advanced search
(probably stands for language requested).

The sa=N only seems to occur after the first page. I haven't figured out what it does yet, but it does appear to affect the results listed if you manually change it.

All of these are just parameters that Google is passing to itself in the URL, to keep track of what the user has asked for, and what page they are on etc.

So I wouldn't worry about them.

[larryhatch]

Hi Dyjkgraaf: I'm not at all worried about any of this, just curious. -Larry

[Dijkgraaf]

For rls this thread [webmasterworld.com] came to the conclusion that it was the release version of the toolbar.
It also gets set by the "Mozilla Firefox Start" shortcut
e.g.
[google.co.nz...]

[Dijkgraaf]

SV1=Security Version 1 (i.e. Service Pack 1 for XP)
.NET CLR 1.1.4322; = Microsoft .NET framework installed on the machine.

[larryhatch]

Thanks again Dijk: SV1 demystified, and .NET CLR too.

That leaves SA=N and/or SA=G and some others. -Larry