PowerBooks with 4 MB RAM as shipped from the factory will still have System 7.1 loaded on the hard drive, since Apple recommends not installing 7.5 on PowerBooks with only 4 MB of RAM. These machines will also include System 7.5 as a "net install" option which the user may elect to install. Or, U.S. customers may request a set of System 7.5 floppies for a $10 shipping and handling charge, and sales tax, by filling out a coupon available from Apple resellers or on AppleLink. [MHA]
Wake On Demand in Snow Leopard
Putting your Mac to sleep saves power, but it also disrupts using your Mac as a file server, among other purposes. Wake on Demand in Snow Leopard works in conjunction with an Apple base station to continue announcing Bonjour services that the sleeping computer offers.
While the requirements for this feature are complex, eligible users can toggle this feature in the Energy Saver preference pane. It's labeled Wake on Network Access for computers that can be roused either via Wi-Fi or Ethernet; Wake on Ethernet Network Access or Wake on AirPort Network Access for wired- or wireless-only machines, respectively. Uncheck the box to disable this feature.