Saves and restores the display when the MS-DOS Shell Task Swapper is used
with EGA monitors. If you have an EGA monitor, you must install the EGA.SYS
device driver before using Task Swapper. This device driver must be loaded
by a <DEVICE> or <DEVICEHIGH> command in your CONFIG.SYS file.
Specifies the location of the EGA.SYS file.
If you are using a mouse on a system that has an EGA monitor, you can save
memory by installing EGA.SYS before you install your mouse driver.