Using as Allvantage  as ISP, with dial-up modem, in "Supercharge"
mode. (Windows 98, Norton Firewall 2001, Systemworks 2001).  When I
disable Norton Internet Security, the SuperCharge mode works fine. 
With Internet Security enabled, I keep getting Norton messages about
attempts to access the Internet, and recommending blocking access. 
Allvantage support says to "set the Norton firewall to allow HSTurbo
through."  How do I do this?

I think I found what you are looking for.
This link tells you how to set your accelerator up so that Norton
firewall will not block it.
http://service1.symantec.com/SUPPORT/nip.nsf/d73981ee6120459e85256eda0045925b/9839f2904979be5388256c370054f0da?OpenDocument&src=bar_sch_nam


It looks like you start by:
"To scan for Internet-enabled programs and apply firewall rules using
the interface

1. Open Norton Internet Security or Norton Personal Firewall. 

2. In the Norton Internet Security main window, in the left pane,
click Status & Settings.

3. In the center pane, click Personal Firewall

4. Click Configure. 

5. On the following panel, click the Program Control tab.

6. Do one of the following: 
       If the Manual Program Control list is empty, click Program Scan
to look for programs that use the Internet.
       If the list is not empty, click one of the rules. On the
keyboard, press Ctrl+A, then press Delete. Click OK. Click Program
Scan as shown in the picture above.

7. On the Program Scan panel, check the box next to the hard drives or
partitions that you want to scan for the Internet-enabled programs.
Click Next.

8. When the Program Scan finishes, you see the following dialog box
that lists all Internet-enabled programs that were found. Select the
programs that you want to create firewall rules for. (Use the scroll
bar to see more program names.)
           To select individual programs, check the box to the left of
the program name. When you are done, click Finish.
           To have all of the programs configured with firewall rules,
click Check All. A check mark automatically appears next to the
programs. When you are done, click Finish.

9. All of the programs that you selected appear in the Program Control
dialog box. In almost all cases, you do not need to modify the
Internet Access or Category options. If you need to modify these
options, click the triangle to the left of the option in the Internet
Access column and select the change.

10. Click OK to return to the Norton Internet Security main window."


If you have any problems, I suggest visiting the link provided since
it has visuals that are pretty helpful.
Bomanator