How to close an excel window in web application

If you don't really care about interacting with the window, our automation suite has the following snippet of code that shuts down Excel completely. I have it in a script file and call it when I want to close down Excel.

function CloseExcel()
{
p = Sys.FindChild("ProcessName", "EXCEL*");
Log.Message('Starting Excel close process');
while (p.exists)
{
p.Close();
//Wait until the process is closed.
isClosed = p.WaitProperty("Exists", false);
//If closing failed, terminate the process.
if (isClosed == false)
{
Log.Message('isClosed is still false');
p.Terminate();
}
p = Sys.FindChild("ProcessName", "EXCEL");
}

Log.Message('Excel close process successfully terminated');
}