1. Assigning a direct or sequential access bound library involves allocating the z/OS data set in which the library resides

2. Assigning a direct or sequential access bound library or a DIV library involves allocating the z/OS data set in which the library resides

3. The invention relates to a method, a device and a system arrangement for access to at least one object (10) in a data structure (12), from at least one application (A) of a number of applications (A), whereby the access and/or all operations carried out on the data structure (12) occur by means of an accessor (16), presenting a common interface, whereby the accessor (16) accesses a selection of objects in a hierarchically-organised structure by means of a position stack (14), in which sequential access paths for the objects (10) for access are stored.