1. Method for binding first data from first removable read-only storage medium and second data from second storage medium, comprising the steps of determining from inserted first read-only storage medium first identifier (organization_ID), second identifier (disc_ID) and first data set (index file); receiving a command for starting an application; determining if on the second storage medium a first directory according to the first identifier (organization_ID), and under the first directory a second directory according to the second identifier (disc_ID) are available, and if so, then performing the following steps of reading from the second directory a second data set and extracting from the read second data set a list of files related to said application; determining that said related files are available either on the first read-only storage medium, or on the second storage medium under the first directory; generating a virtual file system (VFS) comprising said available related files; and starting said application based on the generated virtual file system (VFS).