This application lists primes and pairs of twin primes within a given range. The program offers to enter an initial number and choose an interval from three alternatives (10, 100, 1000). There is also an additional option for entering both initial and terminal numbers. In this latter case, the allowed maximum and minimum differences of the initial and the terminal numbers are correspondingly 2000 and 2. Besides getting the expected list of primes and pairs of twin primes, forward and backward