Hi list, I am currently digging into luatex to fix synctex support when typesetting does not follow the standard ltr order. Hartmut suggested to take a look at the box direction so I tried to use the box_dir(aNode). With a bit of reverse engineering, I found how to use this information, but I need some confirmations from you. For the moment, I focus on hlists and I have a few questions. 1) I found that \pardir ignores the first letter argument, is it expected behaviour ? 2) What is the difference between \texdir LTB and \textdir RTB ? 3) for a box created with \texdir LTB , the height and the depth are equal. Is it always true ? 4) I saw that text direction has something to do with rulers, but what about the other nodes ? On another respect, I see that none of luatex nor context command supports the -synctex option. Is there a special reason or is it just a bug ? Regards