tslib

Hi everyone,
can anyone give me some good informative links on 'tslib' and how to configure it/use it.I don't have any idea about tslib except that it's some linux library for touch support .

A few more queries.
1)If i develop some Qt application(am using QT 4.4.3) with touch screen feature and install it in an S60 phone.Will it work there as well without any changes in the code?
Or, is there some equivalent of 'tslib' for the Qt+S60 combination.If so,please let me know what it is.
2)From which version of QT is touch facility supported?is it from 4x onwards or 3x onwards.
Thanks in advance.