1/2. You can't currently link from the details or notes of a Text item to another UR item, if that's what you mean.
3. Yes, you can enter/paste URLs into the detail/notes of a Text item and click the links to open them. You can also link or copy all or part web pages into UR in various ways.
http://www.kinook.com/UR/Manual/capt...nformation.htm
You don't have to start over if you purchase UR; a license key will simply activate the full functionality of UR (no expiration or db size limits).