Ah, there we're getting in to PRIMOS architecture (and, by implication, that of 
most UNIX variants).
 Ring 0 was the innermost ring, effectively the kernel, where you had to be 
extremely privileged to do anything at all.
 Most users executed in Ring 3.
 Ring 1 consisted mostly of interludes to allow less-privileged users access to 
kernal functions.
----- Original Message -----
From: Wjhonson
Sent: 12/05/12 11:09 AM
To: u2-users@listserver.u2ug.org
Subject: Re: [U2] Advantage of indirect call in BASIC

 Why do you call it "ring" jump in particular? What's the "ring" ?
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