What Is OTA / VM?

>From the Forth Language Help System, Explanation of Stack Diagrams, the following paragraph contains undefined acronyms, OTA and
VM. Anybody know what they stand for?

"OTA is based on an architecture incorporating push-down stacks ("Last In, First Out" lists). The data stack is used primarily for
passing parameters between procedures. The return stack is used primarily for system functions such as procedure return addresses,
loop parameters, etc. The VM contains other specialised stacks that are described elsewhere."

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Dennis W. Bulgrien, Engineer            Mailto:dbulgrien_at_vcsd.com
VertexRSI, Controls and Structures      http://www.vcsd.com
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