Abstract: Systems and methods for remote control of computers and computing devices, such as tablets and mobile phones, including control software run on a control device, and a client application running on one or more controlled devices in network communication with the control device. The control device can be used to selectably lock or otherwise control the controlled device from further usage. In some examples, the systems and methods include multiple controlled devices. In some further examples, the systems and methods include a third-party provider that stores user credential information and generates corresponding external IDs, and both the control software and client application query the third-party provider upon startup to validate that the controlling user is authorized to lock the controlled devices.