[jshzh]

I know I am getting greedy and pushy but this cool feature may bring the experience of reading in a library to users of Koreader: opening multiple books at the same time and switching back and forth. This function is useful for people who need to consult other related books without closing the current one. It will be helpful also for comparing different editions of one book or the same book in different languages. It doesn't seem to drain system resources. This was realized in Pocketbook a while ago and doesn't slow down old Pocketbooks which are inferior in processor speed and ram size to the new models of Kobo and Kindle.