webservice client implementation

guyz again.... ;)

For our webservice application, we have the webservice running in our cmpany webserver. Also we are implementing a client application which will invoke this webservice and this client application has to be supplied to our customers. basically the duty of client application is to transfer a xml file to the webservice. How can I implement this client in a light weight manner.

if I use VS.Net, I need to make sure .net framework also supplied(?, or any more runtime?). I want to make this client app as small as possible.
Any suggestion?!!

Thnx!!

suggestion
for client app, use javascript as much as possible, which will increase client speed
by reducing net calls,
also reduce the number of callbacks to the server process,
which will include button clicks events to ASP.NET server
use javascript to validate most stuffs including events, text/data validations etc
so server routing will be reduced,

transffer the xml thru network protocols using sockets (SSL)

Paresh.

Thnx for the info.
sorry..forgot to mention that the client application may be even a COM component, can we call a webservice without the help of .net framework, may be using c++/COM?
I am bit worried about the 20MB+ .net redistributable..