An equation can be entered using special interface (the buttonson the left and down), as well as by keyboard. The symbols /, *, _, ^, selection by mouse and keyboard, copy and past and other intuitive posibilitites work also.
Submit button calls message with the entered equation as MathML.
Tools: AS2. The editor was developed as a part of large american educational server. My contribution: participating in architecture design, development of the core (parcing and display of MathML), support.