Create stock forex signals in web application

Hello, I am wondering if it is possible to create real time forex signals where: - i host some kind of charting software on the web -users can login to create signals, receive them by email - signals are basically based on indicators built in charting software and price crosses indicator( for example, to be able to receive signal when price crosses moving average i dont know what charting software, probably metatrader wont work, it most probably have to be flash software, it can be forex and stocks charting software. Thanks