## ALP Programming Guide and Reference

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### Return Codes

When ALP completes, it passes a return code back to the program that invoked it. This return code shows whether ALP completed successfully or with an error.

The return codes are:

0 Normal program completion.
1 User-specified file not found.
2 Unexpected system error.
3 Terminated by user or operating system.
4 Syntax errors in input file.
5 Command line usage error.
6 Internal sanity check failure.
7 Error accessing ALP messages file.