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A method of using a geographical location identifier of a real estate property listing as a multi-listing service identifier of the listing includes providing a geographical location identifier that represents the geographical location of a real estate property listing, and using the geographical lo

A method of using a geographical location identifier of a real estate property listing as a multi-listing service identifier of the listing includes providing a geographical location identifier that represents the geographical location of a real estate property listing, and using the geographical location identifier as the multi-listing service identifier for the real estate property listing.

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A method of using a geographical location identifier of a real estate property listing as a multi-listing service identifier of the listing includes providing a geographical location identifier that represents the geographical location of a real estate property listing, and using the geographical lo

A method of using a geographical location identifier of a real estate property listing as a multi-listing service identifier of the listing includes providing a geographical location identifier that represents the geographical location of a real estate property listing, and using the geographical location identifier as the multi-listing service identifier for the real estate property listing. ing among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 10 further comprising characterizing the patient as having atrial fibrillation when the spectral entropy exceeds the threshold and atrial flutter when it does not. 12. An apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms, such apparatus comprising: means for forming a residual file by subtracting a template heartbeat from each heartbeat of an electrocardiogram of a patient; means for estimating a spectral entropy of atrial cardiac activity from the residual file; and means for determining that the patient has atrial fibrillation when the spectral entropy is greater than a predetermined value. 13. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 12 wherein the means for determining that the patient has atrial fibrillation further comprises means for determining that a probability density function of the spectral density has a plurality of dominant frequencies. 14. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 13 further comprising means for identifying a temporal location of a plurality of R-waves within a plurality of QRS complexes of a heartbeat of the patient within the cardiac sample file over the sampling interval. 15. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 14 further comprising means for determining an average temporal distance between successive R-waves identified within the QRS complex of the heartbeat of the patient over the sampling interval. 16. An apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms, such apparatus comprising: means for recording an electrocardiogram of a patient as a cardiac sample file by sampling a cardiac activity of the patient over a sampling interval; means for identifying a temporal location of a plurality of R-waves within a plurality of QRS complexes of a heartbeat of the patient within the cardiac sample file over the sampling interval; means for determining an average temporal distance between successive R-waves identified within the QRS complex of the heartbeat of the patient over the sampling interval; means for forming a template of the QRS complex and T-wave by averaging respective sample values ahead of and behind the identified R-wave; means for estimating a spectral entropy of atrial cardiac activity from the electrocardiogram of the patient; and means for determining that the patient has atrial fibrillation when the spectral entropy is greater than a predetermined value. 17. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 16 further comprising means for creating a residual cardiac sample file by subtracting the template of the QRS complex from the plurality of QRS complexes within the cardiac sample file. 18. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 17 further comprising means for determining a power spectral density within the residual cardiac waveform. 19. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 18 further comprising means for determining the spectral entropy of the residual cardiac waveform from the power spectral density. 20. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 19 further comprising means for comparing the spectral entropy with a threshold value. 21. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 20 further comprising means for characterizing the patient as having atrial fibrillation when the spectral entropy exceeds the threshold and atrial flutter when it does not. 22. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 12 further comprising means for recording the electrocardiogram as a cardiac sample file by sampling a cardiac activity of the patient over a sampling interval. 23. An apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms, such apparatus comprising: a residual file formed by subtracting a template heartbeat from each heartbeat of an electrocardiogram of a patient; an entropy processor adapted to estimate a spectral entropy of atrial cardiac activity from the residual file; and an evaluation processor adapted to determine that the patient has atrial fibrillation when the spectral entropy is greater than a predetermined value. 24. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 23 wherein the evaluation processor further comprises a peak detector adapted to determine that a probability density function of the spectral density has a plurality of dominant frequencies. 25. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 23 further comprising a sampling processor adapted to create the electrocardiogram by sampling a cardiac activity of the patient over a sampling interval and store the samples within a cardiac sample file. 26. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 25 further comprising a waveform processor adapted to identify a temporal location of a plurality of R-waves within a plurality of QRS complexes of a heartbeat of the patient within the cardiac sample file over the sampling interval. 27. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 26 further comprising a timing processor adapted to determine an average temporal distance between successive R-waves identified within the QRS complex of the heartbeat of the patient over the sampling interval. 28. An apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms, such apparatus comprising: a sampling processor adapted to create the electrocardiogram by sampling a cardiac activity of a patient over a sampling interval and store the samples within a cardiac sample file; a waveform processor adapted to identify a temporal location of a plurality of R-waves within a plurality of QRS complexes of a heartbeat of the patient within the cardiac sample file over the sampling interval; a timing processor adapted to determine an average temporal distance between successive R-waves identified within the QRS complex of the heartbeat of the patient over the sampling interval; a template processor adapted to form a template of the QRS complex and T-wave by averaging respective sample values ahead of and behind the identified R-wave; an entropy processor adapted to estimate a spectral entropy of atrial cardiac activity from an electrocardiogram of a patient; and an evaluation processor adapted to determine that the patient has atrial fibrillation when the spectral entropy is greater than a predetermined value. 29. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 28 further comprising a comparison processor adapted to create a residual cardiac sample file by subtracting the template of the QRS complex from the plurality of QRS complexes within the cardiac sample file. 30. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms as in claim 29 further comprising a Fourier processor adapted to determine a power spectral density within the residual cardiac waveform. 31. The apparatus for differentiating among atrial-flutter, atrial-fibrillation and other cardiac rhythms