Rational Robot and Ration Functional Test(RFT) are two different test automation products and both from IBM.

Ofcourse, As the previous person said, IBM bought Robot a while ago.

RFT is from IBM and use Java kind OOPS language (Objects & stuff like SILK TEST TOOL) & VB.net as languages whereas Robot use SQA basic (like VBA code) for scripting.

Robot works very well with Power Builder applications, whereas RFT works very well with J2EE projects, ASP.net, VB Projects as well as many other.

RFT is most advanced version with lot of features like supports automating mainframe testing wih emulators, etc. There is lot to talk about it..