:SCREEN MAIN
TEXTONLY,"World Model",50,5,0,0,C|Times New Roman|30|B|200-55-0,
TEXTONLY,"Main Menu",50,18,0,0,C|Arial|24|B|0-0-255,
RECTANGLE,"",20,30,60,46,C||||0-0-255
BUTTON,"Review Model Structure",50,35,50,6,C,,,STRUCTURE
BUTTON,"Simulate the Model",50,45,50,6,C,,,SETUPSCENARIO
BUTTON,"Play a Game",50,55,50,6,C,,\
SIMULATE>RUNNAME|?Name for new game output,STARTGAME
BUTTON,"Analyze Simulation Results",50,65,50,6,C,,SPECIAL>ALIASSCREEN|ARETURN|MAIN,ANALYSIS
BUTTON,"? Help ?",50,80,40,6,C,,SPECIAL>WINHELP|VRHELP.HLP|1100
BUTTON,"Exit",50,90,40,6,C,Qq,SPECIAL>ASKYESNO|Do you really want to exit?&MENU>EXIT,
This application is centered around a main menu from which different things can be done, and which can be returned to after the user does something. This is a common way to organize an application (although you can organize it differently). The different options are all presented using buttons. The Help button calls up the Windows help engine on the Vensim Model Reader help file. This invocation actually references a specific topic in that file. You can use the WINHELP command without a topic number to bring up the opening screen of the help file.
