Terminals That Do Not Support Windows - Compaq DEC Text Processing Utility (DECTPU) Guide Manual

DEC Text Processing Utility Data Types
3.14 Window Data Type

3.14.8 Terminals That Do Not Support Windows

DECTPU supports windows only for ANSI character-cell terminals.
Noncharacter-cell terminals do not support windows and are considered
''unsupported devices.''
If you are using an unsupported device, you must use the /NODISPLAY qualifier
when you invoke DECTPU. /NODISPLAY informs DECTPU that you do not
expect the device from which you are issuing DECTPU commands to support
screen-oriented editing. If one of the previous conditions exists and you do not
specify the /NODISPLAY qualifier, DECTPU exits with an error condition.
You are using an unsupported device if logical name SYS$INPUT points to an
unsupported device, such as a character-cell terminal.
Appendix B contains more information about DECTPU terminal support.
Chapter 2 contains more information on the /NODISPLAY qualifier.
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