How Torque programming flow organization?

Hi friend Please see the code as below:
new GuiChunkedBitmapCtrl(MenuScreen)
{
profile = "GuiContentProfile";
horizSizing = "width";
vertSizing = "height";
position = "0 0";
extent = "640 480";
minExtent = "8 8";
visible = "1";
helpTag = "0";
bitmap = "./interfaces/emaga_background";
groupNum = "-1";
buttonType = "PushButton";


new GuiButtonCtrl() {
profile = "GuiButtonProfile";
horizSizing = "right";
vertSizing = "top";
position = "29 237";
extent = "110 20";
minExtent = "8 8";
visible = "1";
command = "LaunchGame();";
helpTag = "0";
text = "Start Game";
groupNum = "-1";
buttonType = "PushButton";
};
new GuiButtonCtrl() {
profile = "GuiButtonProfile";
horizSizing = "right";
vertSizing = "top";
position = "29 291";
extent = "110 20";
minExtent = "8 8";
visible = "1";
command = "Canvas.pushDialog(SetupScreen);";
helpTag = "0";
text = "Setup";
groupNum = "-1";
buttonType = "PushButton";
};
new GuiButtonCtrl() {
profile = "GuiButtonProfile";
horizSizing = "right";
vertSizing = "top";
position = "29 434";
extent = "110 20";
minExtent = "8 8";
visible = "1";
command = "Quit();";
helpTag = "0";
text = "Quit";
groupNum = "-1";
buttonType = "PushButton";
};
};
//--- OBJECT WRITE END ---


the codes was experts from a book,I read the codes many times, over and over again,I start think a more important problem,How to run this code as appropriate usefull,I don't understand the programm flow of Torque,I remember when I use C++,I just run programm in main.cpp file and in main function,but how to let Toque run programm?