Commodore 128D - Windowing; Using the WINDOW Command to Create a Window

Windowing
You don't have to trace an entire program. You
can place TRON within a program as a line prior
to the program section causing problems. Put
the word TROFF as a program line after the trou
blesome section. When you run the program,
only the lines between TRON and TROFF will be
bracketed in the results.
Windows are a specific area of the screen that you define as your
workspace. Everything you type (lines you type, listings of programs,
etc.) after setting a window appears within the window's boundaries,
not affecting the screen outside the window area. The Commodore
128 provides.two methods of creating windows: the WINDOW com
mand and ESCAPE key functions.
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Using the WINDOW Command to Create a Window
The Commodore 128 BASIC 7.0 language features a command that
allows you to create and manipulate windows: the WINDOW com
mand. The command format is:
WINDOW top-left column, top-left row, bottom-right column,
bottom-right row [,clear option]
The first two numbers after WINDOW specify the column and row
number of where you want the top left corner of the window to be;
the next two numbers are the coordinates for the bottom right cor
ner. Remember that the screen format (40 or 80 columns) dictates
the acceptable range of these coordinates. You can also include a
clear option with this command. If you add 1 to the end of the com
mand, the window screen area is cleared, as in this example:
WINDOW 10,10, 20, 20,1
Here's a sample program that creates four windows on the screen, in
either 40- or 80-column format.
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USING C128 MODE—Some BASIC Commands and Keyboard Operations Unique to
86 C128 Mode