This program is an adaptation of Kernigan and Ritchie's famous Hello World program in their famous book, The C Programming Language. It simply dynamically prints Hello World as a centered level 1 heading on a Web Page, and then displays this text as a formatted HTML paragraph whenever the mouse moves over the Descriptive Text line.
Move the mouse over the "Descriptive Text" header and see what happens.
View the source to see how this page was written.
This page is best viewed in Microsoft Internet Explorer 4 or higher.