A server exchanges information between one or more wireless devices to complete a transaction. Original digital camera data is saved in the memory of the secure storage device after performing one or more security functions, including encryption, creation of an authentication file, adding data to the image data such as fingerprinting, and adding secure annotations such as separate data included in an image header. One or more blocks to be moved from the source storage device to one or more other storage-devices are identified. Metrics can include, but is not limited to, execution duration andor execution frequency, processor load, memory usage, network inputoutput, number of dependent dispatches, and the like. Means for attaching and detaching display documents are provided using Velcro\xae Brand material affixed to the top of the flexible backing material and mating document Velcro\xae Brand fastening strips attached to the backs of the display documents. The method includes displaying a first preview image obtained from a first image sensor in a first preview area; displaying a second preview image obtained from a second image sensor in a second preview area; and upon detection of a predetermined first user input in the second preview area, generating a photograph image by using the second preview image.