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sindi keesan wrote:
>
> > dhcp assigns the IP number (allocated by dhcp server).
> 
> It assigns the IP number for my computer?

Yes. That is the whole idea.  The dhcp server keeps track
of vacant addresses and assigns one to your computer when
you want to join the network.

> and had IP address of its own 192.168.1.103 which I did 
> not try to ping.

Why not?
 
> I will ask the library for their default gateway address.

Forget about the default gateway (for now).  You need to
get a connection first.  A gateway is useless without a
connection.  Focus on getting ping to work.

> use iwconfig eth0 key NUMBER or echo it to /proc.

That is a worthwhile line to follow.  Wireless networks,
I believe, are established with certain parameters.  You
will only be able to get a connection to a network if you 
set the correct parameters for that network. 

> And I need to either use the strongest signal

Are trying to connect into an unknown network?  I think 
that could be difficult.  There are also ethical issues.
I thought you were trying to set up a wireless connection
with your neighbor.  In that case you both would use the
same parameters in your network configs and set the same 
key at both ends.  

> Find out the IP number of a strong local signal

There's a lot more to it than IP number.  You need to
set the correct parameters for that network. 

I suggest you experiment with setting up a wireless network
between two of your own computers.  That will give you a
clearer idea of what is involved.

Cheers,
Steven