I am developing an intranet application, in which, in some pages, when the user selects an option, I am using a pop-up window to retrieve the data and displaying it in the main page. The pop-up opens, fetches data, puts in main page and closes itself.

Since the user is not interacting with the pop-up, I would prefer it to be hidden. Can this be done ? I checked a Javascript book, which says the 'alwaysLowered' property can be used to send the pop-up behind other windows but this is a security feature and available only for signed scripts.

My Questions are:
1. Can the pop-up be hidden ?
2. What is a signed script ?