

Help for Shield DOS window 
--------------------------

Use the Shield DOS pop-up window to prevent common DOS viruses from
spreading on your system. 

To view the list of viruses that IBM AntiVirus/DOS knows about, select
Virus list from the Help menu on the main window. Viruses that are
prevented by the shield are marked on this list. 

This is a very important feature. Some common viruses corrupt programs in
such a way that it might not be possible to disinfect them reliably. Such
programs, including IBM AntiVirus/DOS, might not function correctly and
might need to be reinstalled if they become corrupted in this way.
Keeping the DOS shield installed at all times helps prevent this from
happening. 

If you check Install shield, the shielding program will be loaded
whenever DOS is started in the future. The DOS memory space is checked
for resident viruses when DOS is started. Subsequently, the shielding
program monitors activity in DOS for indications of activity from common
DOS viruses. If viral activity is found, you will see a warning. The
virus is not allowed to become active or to spread, and you can use the
infected program as if it were not infected. 

If you uncheck Install shield, the shielding program will not be
installed when DOS is started in the future. 

Normally, IBM AntiVirus/DOS checks high memory (memory above the 640KB
DOS limit) for resident viruses.  This check might cause problems on some
systems, especially where hardware adapters are sensitive to having their
memory space read.  A common symptom of this problem is that the hardware
adapter (often a communications adapter) does not function properly when
DOS shielding is installed.  If this is a problem, uncheck the Check high
memory check box, select the OK button to save the settings, and then
restart your system to let the new settings take effect. 

You can add a local message to the message displayed when viral activity
is found by the shield. To do so, modify or create a file named LOCAL.MSG
in the same directory as IBM AntiVirus/DOS, and put the text that you
want displayed into it. To be displayed properly, the message in this
file should have no more than 55 characters in each line and no more than
512 characters total. (You should count each new line past the first line
as requiring an additional two characters.) 

If a virus is found, we strongly recommended that you open IBM
AntiVirus/DOS and check your system for viruses as soon as possible. 


Help for Shield DOS OK 
______________________

Use the OK push button to confirm that you do or do not want DOS
shielding to be installed when DOS is started. 


Help for Shield DOS Cancel 
__________________________

Use the Cancel push button to close the Shield DOS pop-up window and
return to the previous window. No action is taken. 
