Intranet should by an information system of company running on internal network. You can imagine it as a web application, which is thru internet browser enabling sharing of informations between employees and branch offices of company. Intranet could contain for example attendance system, corporate files, templates of company documents, selected informations from accounting, read and send emails etc. If it is required, is possible to ensure secure access to intranet from public internet, what should be useful for still traveling commercial representatives and managers. For access to intranet is also possible to use mobile phones and devices equiped with WAP or web browsers. Another advantage of intranet system based on internet protocols is easy installation - intranet system on user side require only web browser and security certificate.