theos911: Download MouseKey 1.1 from here, I think that's what you want.
http://www.macdrivermuseum.net/input.shtml
Dimitris1980: I have a 2-button ADB mouse that does a click-hold / click-release for the second button, so it's pretty much still a 1-button mouse. There probably are some with working extra buttons, like the Logitech MouseMan, but they will need a piece of software to use the extra buttons. Have a look around and on the website above. You will probably find one if you really want one. I was under the impression that it was possible to use a serial mouse with a Mac - I remember an old control panel that claimed to enable serial mice. You would presumably need some sort of adapter. That might be a way to get a second button.
http://www.macdrivermuseum.net/input.shtml
Dimitris1980: I have a 2-button ADB mouse that does a click-hold / click-release for the second button, so it's pretty much still a 1-button mouse. There probably are some with working extra buttons, like the Logitech MouseMan, but they will need a piece of software to use the extra buttons. Have a look around and on the website above. You will probably find one if you really want one. I was under the impression that it was possible to use a serial mouse with a Mac - I remember an old control panel that claimed to enable serial mice. You would presumably need some sort of adapter. That might be a way to get a second button.