Human-Computer Interaction (HCI) systems control an ongoing interaction between end-users and computer-based systems. For software-intensive systems, a Graphic User Interface (GUI) is often employed for enhanced usability. Traditional approaches to validation of GUI aspects in HCI systems involve prototyping and live-subject testing. These approaches are limited in their ability to cover the set of possible human-computer interactions that a system may allow, since patterns of interaction may be long running and have large numbers of alternatives. In this paper, we propose a static analysis that is capable of reasoning about user-interaction properties of GUI portions of HCI applications written in Java using modern GUI Frameworks, such as Swing™. Our approach consists of partitioning an HCI application into three parts: the Swing library, the GUI implementation, i.e., code that interacts directly with Swing, and the underlying application. We develop models of each of these parts that preserve behavior relevant to interaction ordering. We describe how these models are generated and how we have customized a model checking framework to efficiently analyze their combination.