Abstract
A window package called VT has been developed for UNIX version 6 and the Heath H19 terminal. The package is written in C and is implemented entirely at the user level. Only a nonstandard system call named port is required. VT enables the user to act as if he is commanding several terminals while using a single CRT terminal. The user can make rectangular windows, each with a shell (UNIX command interpreter), and concurrently run commands in each window. All input and output for each shell is confined to its own window, so each window serves as a virtual terminal. Implementation under Version 7 and later releases of UNIX is planned.
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