4. The method of claim 3 , further comprising: providing the signal associated specifically with a token stored in the reader buffer, based on a condition that the token is to be overwritten in the reader buffer, wherein the reader is configured to provide the signal.
4. The method of claim 3 , further comprising: providing the signal associated specifically with a token stored in the reader buffer, based on a condition that the token is to be overwritten in the reader buffer, wherein the reader is configured to provide the signal. 8. The method of claim 4 , further comprising: receiving a token into the scanner from the reader buffer based on an indication that the token is to be overwritten in the reader buffer, wherein the scanner is configured to receive the token into the scanner.