remote components in VB

the scenario is like this.vb client application has to contact to the remote components over internet and those components will contact the database in that remote machine.
we want to install the client application in hospitals for insurance process.
client program has to access the business logic(remote component).
1) why we choose this because initially we are giving the minimum functionality and we keep on improve the functionality.when wher we increase the functionality we will change the components .
2)if Userinterface changed then we will ask them to down load the new version.
second part is Ok.
where as first part I not able to achieve.

what I need is a simple component which recide in remote machine say ur server where u hosted all ur websites. and client application say in ur office.
both has to configured.I searched in microsoft.com the examples are not working out.

I used DCOM activeX exe for server componet and standard exe for client working fine in LAN in my office but not over internet.

Hi

Have you checked if you are making calls over a firewall.Dcom through firewalls do give some problems.

Thanx Aravind,
yes with fire walls there r some problems.
I am trying with .net
I am struck up at calling xml webserver in VB.net.
Can u hlep me in this regard

Than