Hi Dhanalakshmi,
I failed to find a direct way to determine whether Internet Explorer is in the Full Screen mode. However, when this mode is enabled, some of the browser controls are not visible on screen. This fact can be used as a criterion of the active Full Screen mode. For example, in my case (I use Internet Explorer 9), the value of the Sys.Process("iexplore").IEFrame(0).Window("Client Caption", "", 1).VisibleOnScreen property is equal to "false" in the Full Screen mode.
As for the Maximize and Minimize buttons, I'd recommend that you simply
record clicking the corresponding buttons.
BTW, in the future, please create separate threads for each request that is not related to the subject of the current thread - this will help us track queries in a better way. Thanks for understanding.