Alternative explanation:

You asked what parameters you could put in the snippet you posted to make the browser open a new window. There aren't any parameters that will do that.

When this bit of code is called, the browser is asking for something to display - it's already too late to leave the previous page intact and display this one in a separate window.

To get the document to display in a separate window, you need to change the previous page .

For example, as kulls said, if this redirect is called by a URL, you can change the TARGET in the url. Alternatively, as kprasanna_79 suggested, you can put some javascript into the page that calls this code - perhaps a button that 'onClick' calls the function kprasanna_79 showed you.