Get the IP address of an online Windows Live ID user

[Sanguis]

As the title suggests:

Is it possible to get the IP address of an online user that is logged in with his Windows Live ID using C?
What I'm searching for:

( 1.  User logs in with his account (if needed) )
2.  He submits the e-mail address of the Windows Live ID user
3.  Check if that user is online, and if so, get his (IP) address
4.  Connect, using Winsock, to that user.

I found the SDK but that is in C sharp.. Is it possible in C?
Has anyone of you had experience with this sort of code?

Thanks for any help!

[Sanguis]

As the title suggests:

Is it possible to get the IP address of an online user that is logged in with his Windows Live ID using C?
What I'm searching for:

( 1.  User logs in with his account (if needed) )
2.  He submits the e-mail address of the Windows Live ID user
3.  Check if that user is online, and if so, get his (IP) address
4.  Connect, using Winsock, to that user.

I found the SDK but that is in C sharp.. Is it possible in C?
Has anyone of you had experience with this sort of code?

Thanks for any help!

[benjaminmaggi]

Ask the user to give you her/his machine ip address, maybe a oneliner might help:
"please can you tell me you machine ip address ?"