Designed mostly for academic and corporate environments, Apple Remote Desktop (often called ARD) lets an administrator control several or dozens of computers (http://www.apple.com/remotedesktop). You can see all the screens in a group at once, control a screen to provide support, or push your screen to one or more members of the group. It's also used for installing software remotely and limiting how a computer can be used.
ARD is intercompatible with Screen Sharing in Leopard, as they both use the same underlying VNC technology. However, you must check a box in either of two places to allow remote VNC access in Leopard.
To set Leopard up for ARD, in the Sharing preference pane, check either the Remote Management service or the Screen Sharing service, and then click Computer Settings. Both services then present you with a dialog that has an option that reads "VNC viewers may control screen with password"; check that box (Figure A-3). ARD users on any platform can now gain access (as well as VNC users).
