According to the IMSglobal.org website "Learning Tools Interoperability (LTI) is a standard, developed by IMS Global Learning Consortium, which allows courseware and learning tools from different vendors to be launched from a tool from within an application. The LTI integration allows the student to move seamlessly from one tool to the other, with minimal effort from instructors or students. There are various versions of LTI each with a range of capabilities."
Visit their website at www.imsglobal.org for more information.