You need to re-build the user interface to work with a web server. Usually
this means you have to re-write the interface part.
If you don't want to re-write anything..then you can use windows terminal
server, and keep your code exactly as it is.
It really depends on how many users, and what kind of users you intend to
use your application. If it is a application that a sales force knows, and
is trained on, but you just need remote access, then again Terminal Services
is a good way to accomplish this.
On the other hand, if your users have NEVER used ms-access (or your
application you created with ms-access), then letting them jump in via a web
web link might not be such a good idea due to issues of training, and
perhaps deleting data etc that they are not supposed to!
You can read up on how you can remote connect ms-access here:
http://www.attcanada.net/~kallal.msn/Wan/Wans.html