The script can generate a message telling the viewer that he must fill in an e-mail before submiting. When the viewer returns your server will be able to help him fill in forms with his name and address if he has previously filled in your form. Scripts and applets can be used for a number of artistic effects. Currently the hoover button is very popular. These are buttons that change appearance when the viewer's mouse passes over them.
Small applications can be down loaded with a web page.
For example a bank's web page could have a loan calculator where the viewer puts in certain variables and finds out what his payments would be. JavaScript, Java applets, and VBScript are widely used client side tecnologies. Multimedia Animation, sound, and video can be placed on web sites. We have finally gotten to the point where financial transactions and data transfers can be done safely. Customers can purchase with their credit cards, customers can controll their bank accounts, and industrial corporations can procure products.