Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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All display grabbers capture the contents of the screen when requested, such
as when the user presses the ALT+PRNTSCRN key combination. However, the
grabbers are also responsible for other kinds of support. For example, a
standard-mode grabber initializes, saves, and restores the video context
when switching between Windows and non-Windows applications, and a 386
enhanced-mode grabber paints the client area for non-Windows applications
that run in windows.
 
To distinguish between standard- and 386 enhanced-mode grabbers, Windows
uses the filename extensions .2GR and .3GR. For example, the grabbers that
support the VGA display driver are named VGA.2GR for standard-mode Windows
and VGA.3GR for 386 enhanced-mode Windows. In some cases, a single grabber
may support several display drivers (for example, EGACOLOR.2GR is used for
both EGA.DRV and EGAHIBW.DRV).
 
 
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