Connect Web Service to two applications

[Khadr Sarhan]

I have an client application and server application, I want to make an update program,
In my program I want client send a message to server if there is an new version or not, and server reply with a text message ,send will be done via web service .
Any Help .....

[Khadr Sarhan]

I forgot to mention that send will be done via web service