After dealing with Nuance; the parent company of Omnipage, it is fairly safe to assume that they reserve control sequences for those who are prepared to invest a bare minimum of $25,000 to get an Emerald License. Otherwise; none of their products support this, not even their SDK.
As an aside, I would recommend not doing any development with Nuance. They are horrid to deal with. For example; their documentation indicates that you can use control sequences with their HTTP 1.1x api, but not 1.0. The reason why this is a nuisance:
- Only HTTP 1.0 is documented.
- All their examples are old and unclear what version of the HTTP Framework they are working with.
- They don't tell you anywhere that while control sequences work with 1.1x, they fundamentally will NOT WORK if you don't have an "Emerald License" that costs again, $25k
- They don't even let you test control sequences in the developer sandbox.