ModemLockDown disables access to the Internet until a supervisor or parent is present to enter the correct password. It can automatically disable Internet access on system startup, or you can allocate one-hour access blocks, on a day-of-the-week basis, for individual users. Dial-up modems are locked, so no malicious programs can take over and dial out unexpectedly. Supports DSLCable (2k, XP, 2k3 only) and Dialup(98, ME, 2k, XP,2k3).

The license of this software is Free Trial Software, the price is $9.95, you can free download and get a free trial.