I finally came across a linux based timer after a long search.
It's call openkiosk
The server package is called nodeview and installs on kde desktop environment
The client package is called openkiosk and also runs on a kde linux desktop. There is also a client version for windows but it is not free. The linux packages are free.Good! Isn't it.

openkiosk requires BerkeleyDB 4.
When i tried compiling on fc6 i got this error :-ldb-4 not found
so i installed the mandriva 2007 nodeview and libldb-4 rpm version for my fc6. Believe me it worked!

the openkiosk client version compiled without flaws.

Beware! As a security measure, your kde applets for all users are disabled. so if you want it enabled u need kiosktools package.

i ve not explore most of it 's features but i ve comfirmed it working!
I generated tickets and sucessfully login to the linux timer server (nodeview) running on fc6 from a windows client running openkiosk.


homepage: http://openkiosk.sourceforge.net/

there is an easy work around to fix your disabled kde applets. open a terminal and type
#kiosksetup

uncheck the "disable kde applets" option.Then logout and login again.