SOS is a system of cadastre, control, treatment and search of information about users attendance requests (internal and/or external). Total web and developed in Java, has a simple and intuitive interface, in a way that technicians, supervisors and the users can easily taking advantage of all the offered functionalities. SOS is a application 100% Web and developed in Java, requiring a relationary database (MySQL, PostgreeSQL, Oracle, DB2..) and a Java applications server (Tomcat, Websphere, Resin,..). It can be implanted in a low cost architecture: Linux + Tomcat + MySQL.