I've tested turning it on/off repeatedly with no discrepancy in results. If only I had a nickel for each reboot. Info:

This is perl, v5.6.1 built for MSWin32-x86-multi-thread
Binary build 628 provided by ActiveState Tool Corp. 
Built 15:41:05 Jul  4 2001

Microsoft Windows 98 Second Edition 4.10.2222 A, with all patches/upda
+tes

Norton Antivirus 2000, with all patches/updates.
[download]

Although I haven't confirmed it (using the on/off test), I am willing to bet that running nmake with NAV active (using my application software mix) would behave the same way. It rebooted my computer every time I executed it. I gave up on it a month ago and got rid of it.

Update: Confirmed. "map" works (simple form) with NAV 2000 disabled. Tested on/off several times. See Re: Re: Perl on Win98 vs. Win/NT/2000? for details.

Perhaps there is something magical about build AS/620 and/or NAV 2001.

@a=split??,'just lose the ego and get involved!';
for(split??,'afqtw{|~'){print $a[ord($_)-97]}