Re: sending message to PC that is offline

From: Gary E. Ansok (ansok_at_alumni.caltech.edu)
Date: 04/08/04 

Date: Thu, 8 Apr 2004 16:30:17 +0000 (UTC)

In article <ebf3e1ca.0404071927.336aaaa0@posting.google.com>,
hnr <marcuj3341@yahoo.com> wrote:
>I'd like to be more specific about what I want my application to do. I
>hope this can be done without requiring the users to have any
>*HARDWARE* except what most users already have anyway - typical PC,
>typical DSL or cable modem and all that stuff. I don't mind if this
>requires me to develop some *SOFTWARE* that the user must install,
>though hopefully not too complicated to develop. This might be an
>application, a driver, whatever.

If you're developing custom software that will run on the user's
computer, you do have a lot more flexibility. The software can
then send a message to your server that says "Hi, I'm user
JoeBlow987, and I'm at IP address 12.34.56.78". It would also
open up a port to listen for incoming messages -- basically, you're
writing your own IM application.

Your software can also send periodic updates, which could stop
the user from getting logged out due to inactivity and let you
know if the IP address ever changes. However, if the user
explicitly logs out from his DSL connection, then I wouldn't
expect that the DSL provider will pass messages either way between
the user's computer and the Internet.

You might want to look at some of the existing IM applications,
and see if you can start with one of those. You'll need to decide
whether you can send your messages over one of the existing IM networks
(perhaps to your custom IM client) or whether you need to create
an entirely new IM server. But the point is that if the user is
"not logged in" to the IM server, or to the DSL provider, he can't
get any messages.

Gary

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