well, I'm going to use this thread to ask my question because I think it has relationship.
I rooted my NC but I don't complete the ADB access.
I installed FTP server in the NC and using a FTP client in my laptop (Filezilla) or MacBook (CyberDuck) I can send files (pdf, epub ...) from PC/MBP to my NC.
Yesterday I sent a .apk to sdcard/tmp (my default directory) and I couldn't install the app.
I tried to copy the .apk to system/app and neither ES Explorer or Astro allowed the operation.
Need I do something to allow install .apk apps?
(I've read that I can mail me the .apk and install from there ... I have to try this)