I believe you are looking at the VEX documents/tutorials. VEX uses 127 and -127 for motor power levels.
For tutorials, you can try the Software Training guide which you can access from the main page of www.robotc.net
, or the quickstart guide which contains a vast library of sample programs.
Please let me know if you have any more questions!
Vu NguyenSoftware Training Development Team
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