wheel.Control.PostMessage(host.cast(uint, 0x020A), new IntPtr(wheel.WParam), new IntPtr(wheel.LParam)); //pass mouse wheel message onto the original control

wheel.Window.Process.MainModule.ModuleName

sp.ConsoleLog(wheel.Window.Process);  // no error, user log: System.Diagnostics.Process (csrss)

sp.ConsoleLog(wheel.Window.RootWindow.Process);  // no error, user log: System.Diagnostics.Process (Idle)

sp.ConsoleLog(wheel.Window.Process.MainModule);  // ERROR, system log: [ScriptEngine.Execute() - ScriptEngineException] Error: Access Denied.

sp.ConsoleLog(wheel.Window.RootWindow.Process.MainModule);   // ERROR, system log: [ScriptEngine.Execute() - ScriptEngineException] Error: Unable to enumerate the process modules.

// Detect if the target process is what we cannot access:
sp.ConsoleLog(wheel.Window.RootWindow.Process.Id === System.Diagnostics.Process.GetProcessesByName("Idle")[0].Id);
// The"idle" process's id seems to always be zero, so the right side of the equal may be replaced by 0:
sp.ConsoleLog(wheel.Window.RootWindow.Process.Id === 0);
// This one also works:
sp.ConsoleLog(wheel.Window.Process.Id === System.Diagnostics.Process.GetProcessesByName("csrss")[0].Id); 

// Case1: Is the mouse on the right edge of screen?
if( wheel.X >= (parseInt(wheel.Window.Rectangle.Right) - 20) ) {
    sp.SendVKey( wheel.Delta>0 ? vk.VOLUME_UP : vk.VOLUME_DOWN ); // tune volume
}
// Case2: Is the mouse on the left edge of screen?
else if ( wheel.X <= (parseInt(wheel.Window.Rectangle.Left) + 20) ) {
    /** In this case, I would like to change the brightness of screen.
         The approach I use here doesn't require the two brightness setting DLLs in this forum because my device doesn't support either or them.
         Instead, it relies on a software called gama panel.
         To use this script, one have to create 7 profiles corresponding to 7 brightness levels in the gama panel software, and assign hotkeys (CTRL+SHIFT+ALT+F1~F7) for them.
    **/
    if (System.Diagnostics.Process.GetProcessesByName('gapa').Length === 0) { // Execute the gamma panel if it is not running
        sp.Run('cmd /c "cd /d D:\\gamma-panel\\ && start gapa.exe"'); // Assume that the path of the software is D:\gamma-panel\gapa.exe
        sp.Sleep(100);
    }
    if ( typeof(BrightnessLevel)==="undefined" ) { var BrightnessLevel = 7 }; // Create a global variable to log brightness level
    BrightnessLevel = BrightnessLevel + ( wheel.Delta>0 ? 1 : -1 );
    if ( BrightnessLevel < 1 )  { BrightnessLevel = 1 };
    if ( BrightnessLevel > 7 )  { BrightnessLevel = 7 }; 
    sp.SendKeys("^+%{F" + BrightnessLevel + "}"); // Switch to corresponding profile via hotkey

    let info = new DisplayTextInfo();
        info.Title = "Brightness tuning";
        info.Message = "Current Brightness Level is: " + BrightnessLevel;
        info.TitleAlignment = 'Center';
        info.MessageAlignment = 'Left';
        info.Duration = 500;
        info.Opacity = 0.7;
        info.Location = 'bottomright';
        info.TitleFont = new Font('Segoe UI', 12, host.flags(FontStyle.Bold));
        info.MessageFont = new Font('Segoe UI Semibold', 12);
        info.BackColor = 'black';
        info.Padding = 15;
        info.FadeSteps = 18;
        info.UsePrimaryScreen = false;
    sp.DisplayTextClose();
    sp.DisplayText(info);
}
// Case3: Is the mouse on the top area of screen?
else {
    let proc = wheel.Window.RootWindow.Process;
    let appName = (proc.Id===0 ? "" : proc.MainModule.ModuleName); // Access the application's name, unless the process id equals 0 (the zero means System.Diagnostics.Process.GetProcessesByName("Idle")[0].Id)
    if(  ["firefox.exe", "msedge.exe", "chrome.exe"].includes(appName)  &&  parseInt(wheel.Y) <= (parseInt(wheel.Window.Rectangle.Top)+64)   ) {  // Is the mouse in the top 64 pixel area of the browser window?
        sp.SendKeys( wheel.Delta>0 ? "^+{TAB}" : "^{TAB}" ); // Navigate among tabs
    } else {
        sp.MouseWheel(wheel.Point, false, wheel.Delta); // Send a mouse wheel event since the original one has been consumed
    }
};