sending string from a windows application to a Web Part

Question

Hi, I have a windows application that contains a textbox and a button. I have installed WSS and i have a Sharepoint server for example "http://www.notshe.com". that contains a web part, it's name is MyWebPart1. what I have tryed to do is, when you click on the button on the windows application it must open Internet Explorer and send the string that has been written in the textbox to MyWebPart1 to show it. I have tryed but no success, Thanks for your help