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For larger programs, as well as for programs that are required to run on systems that do not have the SWI-Prolog development system installed, creating a saved state is the best solution. A saved state is created using qsave_program/[1,2] or the -c command line option. A saved state is a file containing machine-independent14The saved state does not depend on the CPU instruction set or endianness. Saved states for 32- and 64-bits are not compatible. Typically, saved states only run on the same version of Prolog on which they have been created. intermediate code in a format dedicated for fast loading. Optionally, the emulator may be integrated in the saved state, creating a single file, but machine-dependent, executable. This process is described in chapter 12.