right of abode means that you have the right to enter hk for unconditional stay and therefore can work/study/sit around.... whatever it is that tickles your fancy...i believe that if you have "earned" your right of abode(perm ID) as i have (being here more than 7 years) and then you leave for more than 3 years, you lose your perm res status & right of abode. however, instead, you'll be granted right to land. which is basically the same as right of abode, however, with right to land, you can be deported to your country of origin...