This MATLAB exercise computes and compares and contrasts the time and frequency responses of 6 L-point commonly used windows, namely the rectangular window, the triangular window, the Hanning window, the Hamming window, a modified Hamming window and the Blackman window. Pairs of windows can be compared as to time and frequency responses, and even all 6 windows can be displayed on the three graphics panels, if so desired. The file '3.1 Windows Comparisons.pdf' provides a User's Guide for this exercise.