You can look at games like Leisure Suit Larry 2/3 and then Leisure Suit Larry 1 VGA/5/6 to compare capabilities. However, the only true capability differences are sound and graphics, since the whole interface (other than the text parser) is entirely written in the scripts and no part of the interpreter. This means that you could have a point and click interface 100% identical to the one in LSL1VGA/5/6 in an EGA interpreter. You could also create a SCUMM (Monkey Island, etc.) interface, or any other interface you desire. It just involved modifying the scripts.