AltScreen resource

Description
Defines a character string that will be output to switch the terminal from 80-column mode to 132-column mode. Within the string, the sequence \E is translated to the ASCII ESC character (U+001B).

When the 3270 model is 5, and this resource and the defScreen resource are defined, c3270 will automatically change the terminal size when the host switches between the default (24x80) screen and the alternate (27x132) screen.