Improved techniques and apparatus for managing data between a host device (e.g., host computer) and a client device. The data being managed can, for example, pertain to portable computer programs, such as widgets. The managing of the data thus can involve transfer of portable computer programs (e.g., widgets) between the host device and the client device. In one embodiment, the transfer of portable computer programs between a host device and a client device can be referred to as synchronization.