1 03/18/76   old
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 3 Function:  retrieves a file that has previously been saved.
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 6 Syntax:  old {file_name} {system_name}
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 9 Arguments:
10 file_name  name of previously saved file.  If not given, DFAST prompts
11  user.
12 system_name  name of current system (basic, dbasic, or fortran).  If
13  not given and file_name has no language component, DFAST prompts user.