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| O |
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| | octal (base number mode), Calculator ( ) |
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| | on-line help ( ) |
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| | open |
| | | icon into a window ( ) |
| | | text file ( ) |
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| | Open File operation, keyboard equivalent ( ) |
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| | OPEN LOOK ( ) |
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| | Open window, Audio Tool ( ) |
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| | Open Window operation, keyboard equivalent ( ) |
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| | opening |
| | | files ( ) |
| | | | keyboard equivalent ( ) |
| | | folders ( ) |
| | | Image Tool files ( ) |
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| | opening files, File Manager ( ) |
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| | OpenWindows |
| | | keyboard equivalents (accelerators) ( ) ( ) |
| | | overview of features ( ) |
| | | reducing use of mouse ( ) |
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| | OR, logical ( ) |
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| | Or Calculator key ( ) |
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| | organizing mail messages ( ) |
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| | Orig Mode, Tape Tool ( ) |
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| | owner, change file properties, File Manager ( ) |