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Screen Variables
================

Syntax
------

     #include <go32.h>
     #include <pc.h>
     
     unsigned long ScreenPrimary;
     unsigned long ScreenSecondary;
     extern unsigned char ScreenAttrib;

Description
-----------

The first two variables (actually, they are #define'd aliases to fields
in the _GO32_INFO_BLOCK structure _go32_info_block:.) allow   
access to the video memory of the primary and secondary screens as if
they were arrays.  To reference them, you must use
dosmemget()/dosmemput() functions (dosmemget:, *Note   
dosmemput::) or any one of the far pointer functions (_far*:.),   
as the video memory is *not* mapped into your default address space.

The variable ScreenAttrib holds the current attribute which is in use by
the text screen writes.  The attribute is constructed as follows:

bits 0-3  - foreground color;

bits 4-6  - background color;

bit  7    - blink on (1) or off (0).

Example
-------

_farpokew(_dos_ds, ScreenPrimary, ( ((unsigned short) attr) << 8) +
char ));