Can't see network computers that are sitting at their logon prompt

I have an Airport wireless network in my home. My two computers (one Imac, one Macbook) connect to the internet through the Airport connection.
From my Macbook, I can ping the Airport at 10.0.1.1 and get a response. I can ping the Macbook itself (10.0.1.3) and get a good response, too. But when I try to ping the Desktop Imac at 10.0.1.2, I get nothing but "host is down" messages, even though the desktop is booted up and sitting at its logon prompt. If I go to the Desktop and log on, and then come back to the Macbook and ping the desktop again, everything is fine.
Is this the way things are supposed to work -- i.e. a computer system is not available on the network unless someone's logged into it? This seems strange.

In case anyone cares, I found the solution myself.
Under Network in System Preferences, Show->Airport. Then, click "Options".
One of the options says to "Disconnect from wireless networks when I log out". This option was checked on the Desktop but not the Laptop. Don't know why.
Anyway, when I unchecked it, I was now able to connect to the Desktop, even when it was at its logon prompt.
Now, if I could just get the dumb things to wake up across the network ... but I understand this is not doable when the computers are connected wirelessly. Something about the wireless standard not supporting it.

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Can't see network computers that are sitting at their logon prompt

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