The operating theater blood transaction system is a virtual blood banking system that allows computer cross match–compatible blood ordering and delivery in the operating theater remote from the hospital blood bank. It was developed and implemented in our hospital in 1997 and was expanded in 2002 to include an unmatched blood module that allows ordering and issuing unmatched RBCs for intra operative transfusion. During the past 7 years, the system has handled 6,333 cross match requests for intra operative transfusion and issued 20,073 units of RBCs, including 100 units of unmatched RBCs (group O, 72 units; group-identical, 28 units). The OTBTS has proven to be efficient (with a turnaround time for blood ordering and issuing <30 seconds), effective (with a reduced cross match/transfusion ratio and blood wastage), and error free (no delay or error in transfusion or postponement of operation). Furthermore, our experience with the unmatched blood module has attested to the safety and efficacy of computer-controlled, online ordering and real-time, on-site delivery of unmatched RBCs for emergency transfusion. Admin can maintain the Donor’s whole information like blood group, phone number, address, registration details and login details, update, delete the donor’s records and Donor can login and view their related details, edit profile, change password, view their details.