An system for authenticating users of an application program executing at a front-end computer using the security features built into the operating system of a logon computer is provided. Initially, an administrator establishes user accounts for each user with an operating system executing at the logon computer with access to application resources. When the application program starts executing at the front-end computer, the application program prompts the user for credentials. The application program attempts to access resources managed by the logon computer using the received credentials. When access to a resource is successful, the application program knows that the logon computer has authenticated the user and the user is authorized to access the resource. In this manner, the application program can take advantage of the security features built into the operating system executing at the logon computer to authenticate users of the application program and authorize access to application resources.