Fraudulent transfer of Islamabd property

Hi

1) I own a house in Sector F6 Islamabad. I am concerned about someone fraudulently selling my house. What steps can I take to stop fraudulent sale/transfer of my house?

2) On CDA website they state that 'Recently a computerized personal identification system has been installed in admitting counters at OWO, to avoid the fraudulent transfer of properties.' How can I access this system on my computer?