[http://www.fixprotocol.org/ FIX Protocol]
[http://en.wikipedia.org/wiki/CREST CREST] - Central Securities Depository for the U.K., Republic of Ireland, Isle of Man and Jersey equities and UK gilts.
[http://en.wikipedia.org/wiki/Euroclear Euroclear] - Euroclear is an independent Brussels, Belgium-based financial services company that specializes in the clearing and settlement of securities.
PIN/TAN
[http://citeseer.ist.psu.edu/719633.html Outflanking and Securely Using the PIN/TAN-System]