Custom Instant Messaging

I need a new branded instant messaging product that has two distinct stand alone units. The main item will be run from our computer, (we have a server if necessary)which enables us to see which of our end users are online/logged in. We will need to have the facility to choose to send a message to only one of these end users, a tickable/clickable group, or all of them simultaneously. When we receive a reply the respondant must be easily recognisable, and it should be easy to respond immediately to that respondee. As for the end-user, they should only be able to receive messages from us, there should be no communication beween different end-users. It should be easy for them to set up, and easy for us to set them up on our front end. Speed is highly important for this project, and I may have under guessed the price, so please bid as you feel is right. I need something that works, not with any (big) money constraints. There is only a short bid time.. ## Deliverables Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. Complete copyrights to all work purchased. ## Platform Windows