Using One Memory Screen as a Buffer for Many Windows

You are not limited to having one window associated with one memory screen. You can use a memory screen as a buffer for many windows. Some reasons you might want more than one virtual window associated with a memory screen are:

nTo display different parts of the memory screen at the same time.
nTo write to the memory screen using different attributes. Since the window attribute is used by the window output functions, you can use different windows to write with different attributes.
nTo write to different areas of the memory screen. Each window maintains its own virtual cursor position within the memory screen

Designer: To create multiple windows with the same memory screen buffer:

1	Create several windows with the Designer.
2	In your code, open the Designer library, read the windows from the library, and follow Steps 2 through 4 below.

Code:

1	Define several windows. Use wn_vdef() to create one window with the buffer. Use wn_nbdef() to create the other windows with no buffer.
2	Get a pointer to the memory screen by using the function wn_msbuf() on the window defined with wn_vdef().
3	Associate the memory screen with the other windows by calling sw_msbuf() for each window to be associated with the memory screen. `msp = wn_msbuf(first_wnp); sw_msbuf(msp, second_wnp);`
4	Set the memory screen origin in each window to the area of the memory file that you initially want to see in the window.

General: Besides viewing, you can also use each of the windows to write to the memory screen. When doing this, you should consider the following:

nThe virtual cursor for each window is based in the memory screen. Thus, there will be several virtual cursor positions in the memory screen. You should take care that you are writing to the correct position.
nThe window attribute may be different for each window. Take care when using the window attribute to write to the memory screen.
nThe logical attribute array in use by each window may be different. Designer windows use the logical attribute table created in the Designer library that contains the window. Windows created in code use the system logical attribute table, unless you called sw_latt() to assign a different logical attribute array.