Runtime Behavior - Call a Public Program (Magic xpa 4.x)
If the cabinet file or public program name is a valid value, the following behavior occurs:
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The project is loaded. 
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The Task Prefix operations of the main program are executed. 
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The program that corresponds to the public name is executed, and the arguments of the Call operations are passed to the program. 
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When the called program ends, the Call operation is completed. Arguments passed as variables are updated. The variable set as the return value is also updated. 
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The Task Suffix operations of the main program are executed.