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NAST is a technique in SAP-Systems to create messages. Messages can be printed, sent or transferred into IDocs. SAP uses this for many applications e.g. Purchase Orders (PO ). The PO can create a message which might be printed, sent by FAX, or translated into an IDoc of type ORDERS. The IDoc ORDERS can be forwarded in an B2B-process to a vendor.
A process can define how to handle incoming POSIX signals. If a process does not define a behaviour for a signal, then the default handler for that signal is being used. The table below lists some default actions for POSIX-compliant UNIX systems, such as FreeBSD, OpenBSD and Linux.
The interrupt descriptor table (IDT) is a data structure used by the x86 architecture to implement an interrupt vector table. The IDT is used by the processor to determine the memory addresses of the handlers to be executed on interrupts and exceptions. The details in the description below apply specifically to the x86 architecture.