Clicking the right arrow button (or pressing Alt + Right Arrow) will select the next segment for Felix to look up. In MS Word, MS PowerPoint, and TagAssist, this means the next sentence or line of text. For MS Excel, this means the next cell in the worksheet.
Sometimes you may want more fine-grained control of how segements are selected. This is quite simple: just select the text you want to look up, and click the “L” button (or press Alt + L). That will be the segment that Felix looks up. This works in MS Word, MS PowerPoint, and TagAssist.
It’s also fairly easy to extend your lookup segment. This is useful if you want to translate two or more segments/sentences as a single unit. From Word or PowerPoint, press Ctrl + Right Arrow to extend the lookup to the next segment. In TagAssist, the keyboard shortcut is Alt + X. (I plan on making the keyboard shortcuts more consistent in a future version.) Since the Excel interface is cell-based, it’s not possible to extend the lookup from Excel.
In Microsoft Word, you can also control several aspects of segmentation from the preferences. From the Felix menu, select Felix Preferences, then the Segmentation tab.
Here you can select the “stop” characters (which characters mark the end of a segment), whether to skip segments containing only numbers (useful when translating tables of figures), and whether to skip segments unless they contain Asian characters, or unless they don’t contain Asian characters. (The label says Japanese, but it works for Japanese/Chinese/Korean. This is a UI bug that will be fixed in the next minor release.)
The Felix manual has more information about segmentation for the MS Word and MS PowerPoint interfaces.