C
ChUIMonster
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ABL, as a whole and in today's world, is not analogous to T-SQL. Nor was it 25 years ago. But way back in the dark ages of the 90s developers were starting to see that there was a case to be made for separating layers and that it might not be such a good idea to have your UI, data access, and business logic all mushed together. Especially if you were planning to deploy in a client-server environment. Way back then one approach to that problem, in other environments, was to stick a lot of business logic into "stored procedures". (I'm not saying that that was a good approach.) From a certain point of view you could sort of look at Progress' Classic Appserver as a variety of that sort of thinking. If you're a real glutton for punishment you could also probably trace the history of operating modes with footnotes explaining how they were allegedly related to various industry trends over the next 20+ years. Thankfully I have no idea what product management was actually fantasizing about at the time. I'm quite sure that I wasn't happy about any of it though 
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