Ok, Tried some things.
Thank you for pointing me to Cron Manager, excellent stuff.
I've set up a Ftp server on the OS 8 mac, using MacSSH, installed Cron Manager.
Any files named appropriately and placed into the "Cron Events Folder" in the System Folder will be launched.
So made a simple "do beep" applescript. make an alias and name "
*1" (without quotes of course).
*1 means Cron Manager will open it every minutes, *60 would be every hours.
Got that "
*1" alias to a OS X running Mac. From there connected via Ftp to the OS 8 Mac.
Uploaded the "
*1" to the "Cron Events Folder"… And after a minute , Cron Manager opens… An empty text file named "
*1"
Of course, when I upload the "
*1" alias via ftp, it looses his Mac resource forks, and is seen as a text file...
Only way to upload it and keeping these resources is to make it a .sit file.
So made a stuffit archive of a restart applescript also named "
*1 .sit" (note the space after 1, I don't think this is necessary…), then uploaded it back into "Cron Events Folder" via ftp. After a minute, it unstuffed the archive and launched the resulting "
*1" restart script. So it works
You can launch almost any script remotely like that. The caveat is that it as to be with some more delays than 1 minute, otherwise you end up with xx "
*1" files in the "Cron Events Folder"

After restart , it unstuffed again "
*1 .sit" and again launched the script, so I had to be fast emptying the "Cron Events Folder" .
I think best is to make a file called "
*10", so to have 10 minutes of delay, and be able to ftp into the "Cron Events Folder" to delete the files if you need.
Or maybe there is a way to make the script so that it delete any .sit files and move itself out in the "Cron Events Folder" ?...