[ReaperX]

You Wouldnt use SET. You Would use the 'choice' Command.

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Example:

choice /c [possible choices] /n

You Could Use 1-9 or a-z as Possible Choices.
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To Check What Was Pressed You Use 'errorlevel'.

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Example:

choice /c 123abc /n
if errorlevel 6 [command]
if errorlevel 5 [command]
if errorlevel 4 [command]
if errorlevel 3 [command]
if errorlevel 2 [command]
if errorlevel 1 [command]

Possible Choice "c" is the same as Errorlevel "6" Because
it is the 6th Possible Choice. Letters Always Go LAST as
Possible Choices.
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I Tried Explaining that the Best I Could. If Its Not clear Enough go to the CMD and Type "choice /?" (No Quotes).