if you mean that you want to make a bootable cd, you can't. the only amigas that can boot with cdroms are the cdtv and the cd32. with makecd you can do bootable cds for cdtv but i don't know how can these cds been bootable to the other amigas
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if the startup-sequence or any other script has the s flag of his properties on, you don't need to type the command execute, just type the name of the script