Sharing of batch system for multiple users. The idle time batch system is very less. You can assign specific time for the batch jobs so when the computer is idle it starts processing the batch jobs i.e. Autocom cdp pro keygen. At night or any free time. The batch systems can manage large repeated work easily. Disadvantages of batch processing systems. 1) Serial Processing: The Serial Processing Operating Systems are those which Performs all the instructions into a Sequence Manner or the Instructions those are given by the user will be executed by using the FIFO Manner means First in First Out. All the Instructions those are Entered First in the System will be Executed First and the Instructions those are Entered Later Will be Executed Later.