Can someone tell me how I can check for the existence of a computer on the network. I'm assuming that I need to use the API for this.

To help you understand my purpose in this, this is a description of my very simple application. Essentially I have a internal office messaging program. You simply select the user from a dropdown, type a message and hit "SEND" and the message is sent via the NET SEND command using the API. I want to check that the user is there before the message is sent.

Thanks,

Ryan