DynChap provides an additional pseudo hardware token based authentication layer for PoPToP virtual private networks. The authentication uses the user's mobile phone to generate a hash that needs to be entered along with the user's password in a custom connection dialogue. Upon connecting, the VPN verifies the authenticity of the hash. The hash is generated from a serial (by default 32 printable characters) stored in the J2ME based mobile phone and the current time; the VPN server compares this hash against the serial and current time, minus or plus a small deviation (by default 2 minutes). If the username, password, and hash match, access is granted and the custom dialer is closed, the connection can now be controlled like an ordinary VPN connection.
Quarters is a strategy game for two players. Although its rules are relatively simple, it still offers some of the same opportunities for skill as in chess. This program was originally conceived in the summer of 1986 during a study of the mini-max algorithm for chess playing computers, and was thus designed to offer some of the same type of strategies. The game was originally written in BASIC, then ported to Turbo Pascal, then to C, and finally to Java. The Java version is not necessarily object oriented, since it is a crude port from the C version.