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system(), under Windows, does not invoke a command shell and does not support "internal commands" within a command shell. Such commands might be accessed by calling system("cmd /C " || cmd). Future versions of the Windows Unicon will automatically prepend "cmd /C" before the commands: "dir", "cd", "chdir", "copy", "ren", "rename", "del", "erase", "md", "mkdir", "rd", "rmdir", "vol", "label", "verify", "type", "break", "cls", "chcp", "ctty", "date", "echo", "lh", "loadhigh", "lock", "path", "pause", "prompt", "set", "time", "unlock", "ver".
Chapter 17 listings use wrong method names (show() instead of show_modal())
Chapter 17 listings use wrong attribute strings (colwidth instead of column_width)
In Chapter 17's TextField constructors, the size attribute string may not end in a comma when the height will default. Use "size=129", not "size=129,"

I am collecting and putting up examples from the Unicon book. Please send me additions and corrections by e-mail - Clint.