XTerm

The XTerm program is the standard terminal emulator for the X Window System.

It provides DEC VT102/VT220 and Tektronix 4014 compatible terminals for

programs that can't use the window system directly. If the underlying

operating system supports terminal resizing capabilities (for example,

the SIGWINCH signal in systems derived from 4.3bsd), xterm will use

the facilities to notify programs running in the window whenever it

is resized.