It is very simple question :)
It is NOT possible.
Consider:
How would you phone someone if you know nothing about him?
Or how would you come and visit me if you only knew that I'm from Croatia - now you have my name and country? It is possible, but not easy. But without even that info, you cannot.
UPDATE: having IP of the computer changes things:
See here[
^]
And
MSDN[
^]
And
here
IMPORTANT: accessing the computer without user knowledge is illegal in most countries
NOTE:
You cannot use Remote Desktop to create a connection with computers running Windows 7 Starter, Windows 7 Home Basic, or Windows 7 Home Premium. You can use Remote Assistance instead to create a remote connection, but a user on the machine must invite you first.