Computer ID / IP Address Questions

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People...

When I e-mail my office computer at work, from home...If I check out the
e-mail's properties on the Details tab...it tells me the message was
"Received From": 1) a unique ID c/o letters & numbers (e.g.,
bubba9axb7yui4bt); & 2) a 12 digit number (looking similar to
123.456.789.123). I am assuming the first is my Computer ID; & the second my
IP Address.

If I then go to my web mail service (in this case, yahoo), send an e-mail
back to my home computer; & check out that e-mail's properties...in that
message source, the very last "Received From" listing also shows my home
machine's IP address.

So...a few questions:

1) That first ID...that is in fact my Computer ID, unique to only my
machine, right?...& where do I find that ID's location/information on my
hard drive?

2) The second number...that is in fact my IP Address, right? Is that number
unique to my machine, or is it a number assigned by my ISP (meaning...does
it change if I change internet service providers?)

3) How in the heck did yahoo know my web mail message originated from my
computer? Does their e-mail utility do a search of the user's hard drive to
locate that number in a specific file & folder...or do they get it from the
home e-mail address one provides when they sign up?

Thanks,

mark4man


.

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