comunication system with users

Develop a simple software for computers that let know the user that a investment oportunity is available, the oportunity i write it manually from any kind of backoffice (im a forex market operator), the user dowwnload the software for free and buy credits, those credits are associated to his username and for evry single investment alert he receive one credit is used, in the same software i want a button that redirect to a website with the historical of operations and with a little calculator that shows how much money the person could be make if he took al the operations sended, im looking for something simple but with a nice aspect. Crear un software sencillo para computadora que avise al usuairo cuando hay una oportunidad de inversion, la oportunidad la cargo yo desde algun tipo de backoffice de forma manual (soy operador forex), el usuario descarga el software gratis y compra credito, esos creditos se asocian a su usuario y por cada alerta de inversion que recibe se le resta un credito, en el mismo software quiero que tenga un boton que lo dirija a una web con el historico de operaciones que se han hecho en total, busco algo sencillo, pero vistoso en cuanto a aspecto