Item records are sent to eBay from our servers in timeframes. This means that our server sequentially visits WebStores to send item records to eBay about every 15 minutes. However, you may want to get this process happened quicker. For instance, you have just updated the price of a published item and you want to see this new price updated in the live listing. This can be done by clicking on the Push Inventory Feed (Background) button as can be seen in the next figure.
Having clicked on that button, a popup message is displayed to inform you that the server has been informed and is currently dealing with your request.