A system and method for delivering application data to both constrained and non-constrained devices. In a Java implementation, the Abstract Window Toolkit (AWT) is used when a client computer system is not constrained and is running the Java Virtual Machine. When the client computer is constrained and, therefore, is unable to execute the Java Virtual Machine, the server computer uses a second library called a Markup Language Window Toolkit (MLWT) with the same API names as in the AWT. The result of the Java Virtual Machine executing APIs from the AWT within a browser on the client computer system are graphics that appear on the client's browser display. Correspondingly, the result of a server executing a Java Virtual Machine executing APIs from the MLWT is HTML and/or JavaScript that is capable of being processed and displayed by a client computer system without using a Java Virtual Machine. The system and method further determines whether a client computer system is constrained resulting in the use of either the AWT or the MLWT.