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The SPAWN procedure spawns a child process to execute a command or series of commands. The result of calling SPAWN depends on the platform on which it is being used:
Under UNIX, the shell used (if any) is obtained from the SHELL environment variable. The NOSHELL keyword can be used to execute a command directly as a child process without starting a shell process.
Under Windows, a Command Shell is opened. The NOSHELL keyword can be used to execute the specified command directly without starting an intermediate command interpreter shell.
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spawn can be used for calling external excutable file.
Posted By Yang