IMac "unavailable" on network

I have both an iBook and iMac G5, both running OS X 10.4.x. On the G4 is a printer connected which is shared. Also all option at "energy" are set.
The iBook can only print when the iMac is "awake". If the iMac goes to sleep then the iBook cannot find any printers. In that (iMac being asleep) situation the iBook 's finder also cannot find the iMac in the network.
Is there anything I can look into to solve this behaviour?

Use the Energy Saver preference pane (in System Preferences) on the iMac to not allow the processor to sleep.
When the processor sleeps all the services stop.

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John, thanks for the email so quickly.
I too hope I haven't tried "everything" either but I am reasonably technical. I had done what you suggested to do before but I did both again.
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The executable will be run on the client computer, if you acces them by a shared drive or something.
But download time can be noticable, but it shouldn't cost performance, be aware that all users will share the same app.ini file.
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http://stackoverflow.com/questions/5134568/copy-a-file-in-applescript

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http://fmforums.com/forum/topic/85381-applescript-to-copy-file-from-network-volu me/
http://stackoverflow.com/questions/5134568/copy-a-file-in-applescript

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Greetings from Northern Ontario, Canada

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IMac "unavailable" on network

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