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what is the definition of a "code grabber" ? how can we make it (anyone has the details of the circuit ? and the program details?). where can we buy it from (if we don't want to make it). Is a "code grabber" witch detect the signal for a car key is the same witch detect a signal of a gate for example ?
I think that you're reffering to something more related to electronics than C# , however having done some C# signal processing programming in the past I know that the language is very capable of making the software side of either one of the two systems that you're reffering to. as for what it is, I guess any devise that would detect a code from another devise trough a wireless signal just due to the second devise being in range, something constantly scanning for that signal.