Handshake

New Delhi, March 11 (IANS) Home Minister P. Chidambaram Thursday asked his officers to stick to timelines and complete by 2012 the Crime Criminal Tracking Network and Systems (CCTNS) project, a national databank of crime and criminals and their biometric profiles.
'Terrorists and organised criminals have developed overt and covert technologies, including information communication technology. This has made the job of law and order professionals far more challenging than ever before,' Chidambaram said, advocating a real time decision support system.
Addressing the silver jubilee function of the National Crime Record Bureau (NCRB), the home minister said the CCTNS database will have a handshake with databases of over a dozen agencies of the criminal justice system like courts, jails, immigration and passport authorities.

Could you please explain to me what "handshake" means in this context?

Source : http://in.news.yahoo.com/43/20100311/812/tnl-complete-crime-tracking-mission-fast.html