DISTRIBUTED SYSTEMS (OPERATING SYSTEMS); SPECIAL PROGRAMMING METHODS; VERTEILTE ANWENDUNGEN + CLOUD COMPUTING + GRID COMPUTING (COMPUTERSYSTEME); SPEZIELLE PROGRAMMIERMETHODEN; DISTRIBUTED APPLICATIONS + CLOUD COMPUTING + GRID COMPUTING (COMPUTER SYSTEMS); SYSTEMS ANALYSIS + SYSTEMS DEVELOPMENT + SYSTEMS DESIGN (COMPUTER SYSTEMS); VERTEILTE SYSTEME (BETRIEBSSYSTEME); SYSTEMANALYSE + SYSTEMENTWICKLUNG + SYSTEMENTWURF (COMPUTERSYSTEME)