Quote Originally Posted by Dante View Post
1-Are the Qt principals same in Qt for embedded systems and Qt for PCs?(except of specific features)
Yes, it's the same API.

2-Which mobile phone operating systems do Qt support and with which version of Qt every one can be programed?
Embedded Linux, Windows CE, Symbian S60 (the latter port is incomplete). They all use recent versions of Qt4.

3-Should we install the embedded versions of Qt on a PC?
Yes, if you want to program for Qt/Embedded (Linux) then it's a good idea to build it for your desktop as well.

4-Can we compile Qt sources in an OS we don't have specific version of Qt for that OS?
If you're asking if you can cross-compile Qt then yes, you can.

By the way - posting replies to your own posts is a good way of not getting any answers.