Embodiments are provided to create a virtual application or suite of virtual applications. In an embodiment, a system is configured to create a virtual package which includes information that can be used in a hosted virtual application environment. The system can provide bits of a virtual package based in part on user demand for an application or certain application functionality. In one embodiment, a system includes a sequencer component which can create a virtual package which includes information associated with setup-time and run-time changes made to a computing device. The sequencer component can use a number of extensible markup language (XML) files to create the virtual package. Other embodiments are available.