how to compare and retrieve documents from a server

Question

I want to write a program using vb.net tht compares the name of a document on my desktop to the name of the document on the server. If they're the same then I'd like to retrieve it and have it replace the file I already have.
How can i do this? Does this mean that i have to write a web application cuz i hope not. I dont no anything about those. I am using that server for storage purposes only so i assumed that i didnt need a database for the name of the document.
So, how can i do this? Is there an existing class/package in vb.net that does something like this?
Thanx.