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| Checking information | Object Management | |||||||||||
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| Bitmaps | Turtles | |||||||||||
| Controls | Windows | |||||||||||
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| LIST? | checks for its input being a list | ||
| NAME? | checks whether its input is assigned a value | ||
| NUMBER? | checks its input for being a number | ||
| PRIMITIVE? | checks its input for being a built-in procedure | ||
| PROCEDURE? | checks its input for being a user-defined procedure | ||
| WORD? | checks its input for being a word | ||
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| DECLARE (DCL) | creates an object | ||
| EVERY | outputs a list of objects | ||
| IS.A | check an object for being of a specific type | ||
| NEW | creates a new Logo object | ||
| TYPEOF | reports the type of a name | ||
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| SNAP | moves parts of the graphics window into a bitmap | ||
| SNAPSIZE | outputs the size of a bitmap | ||
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| ALERT | displays an alert box | ||
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| ACTIVEWINDOW | reports the name of the active graphics window | ||
| CLOSEWINDOW | closes a window | ||
| SETTWINDOW | attaches all active turtles to a window | ||
| SETWINSIZE | sets the size of a window | ||
| SETWPOS | sets the position of a window | ||
| TWINDOW | outputs the name of the window of the first active turtle | ||
| WINSIZE | reports the size of a window | ||
| WPOS | outputs the position of a window | ||