I want to creat a new user on an NTTacPlus 2.0
Can anyone give me hints to do it by HyperTerminal?
Please give all your comments even with other methods.

No comment ?

I'm wonder, cause of this usefull topic left alone?!

LOL ^^

well, you should have begin by what the hell is "NTTacPlus" XD
i asbolutely dunno and im too lazy to google it

Are u Refering To This?
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What is NTTacPlus?

NTTacPlus is a centralized server application for the control and management of remote access to the network through the standard protocols TACACS+ (developed by Cisco) and RADIUS (developed by Livingston, now IETF standard). This application implements the AAA model (Authentication, Authorization, Accounting).
NTTacPlus can operate both as a stand alone program or as a service under Windows NT.
NTTacPlus is based on a user database that can be implemented in two different ways: a set of simple text files, each file representing a user, and an ODBC SQL database (such as Microsoft Access or SQL server) in which there are two different tables: one for user accounts and one for the group profiles. User profiles contain account parameters (password expiration date, login hours and credits, etc.).
The Network Access Server (NAS) sometimes also called Communication Server, Remote Access Server or Terminal Server is a device which usually accepts remote accesses through phone calls on analogic or ISDN lines with modems or ISDN terminal adapters. The NAS allows to connect dial-in users to the internal network (Intranet) - typically a Local Area Network (LAN) - or to the Internet as a whole.
NTTacPlus accepts authentication and authorization queries from the NAS (such as 3Com Total Control, Ascend Max, Livingston PortMaster, Cisco AS5200), examining user profiles and taking into account the characteristics configured for each user.
Moreover, NTTacPlus acquires the accounting data sent by the NAS and records it on a ODBC datasource. This allows to make accounting data available for statistical purpose processing about accesses, or for the creation of detailed billing reports, etc.
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taken from http://www.tacbox.com/nttacplus.htm

yea, that's NTTac
But is there any bugs? exploits? is it possible to do some ... via modem ?

Hi, first of all i've to know do you have complete access to server or not ? if yes just login on terminal service , then try to find NTACPLUS folder , there're shold be a folder that named USERS , here search for "admin" then open this file via notepad,then find the password and right user name, then run nttacplus and enter user name and password . then press F10 , now you have all things to create user .