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To create a "Hello world" web application, you could drag and drop a push button onto a Web Page and then add code for the button click event to show an alert. The resulting code might look like the following:

     Begin_Com Role(*EXTENDS #PRIM_WEB)
    
  Define_Com Class(#PRIM_PHBN) Name(#Button) Displayposition(1) Left(63) Parent(#COM_OWNER) Tabposition(1) Top(27) Caption('Click Here') Height(50) Width(150) 
     Evtroutine Handling(#Button.Click)
  
       #sys_web.alert( "Hello World" ) 
     Endroutine 
     End_Com

If you like, copy and paste this code and create your own Web Page, then from the Home ribbon, save and compile the Web Page.

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If you want to nominate a different target browser and/or base URL to be used when executing the web page, go back to the Home ribbon and use the dropdown on the Execute icon to select the appropriate options.