I do have some further feedback: my Horizon box carries a label claiming to be a Samsung SMT-G7401 /XEN so I asked about that and received the below response. It still does not solve the Guide key question but the workaround in any case is to click Menu and then OK for the default option of Guide.
I hope this helps!
The functions for your Samsung Horizon SMT-G7401 /XEN (with Basic Code C3451) are unfortunately not available as the code 3451 do not allow extra functions.
Please use the www.simpleset.com website to download onto your URC 6430 the code SAT 3477.
| BRAND | MODEL NUMBER | BASIC CODE |
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| Samsung | Horizon SMT-G7401 /XEN | S3477 |
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Below the function codes for your devices, which you can use to program any missing keys with KeyMagic setup:
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| 38466 | 0 | |
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| 23026 | Fast Forward (Right) | |
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To read about the basic code programming and KeyMagic setup instructions, you can also visit our website.
We hope this answers your query, but should you have further questions, do not hesitate to email us, or check our online support section.