Unattended Initiate (UI) and Round Robin (RR)

"Unattended Initiate" refers to a relatively (in computer terms) ancient means by which a dialup modem can be set to "initiate", or turn on, dial out to the ISP, and connect without prior direct user action on the modem itself (for instance, when a user attempts to access a web page or to have the email client poll for email while no modem connection is active); a brief discussion of it may be found Here, about a quarter of the way down the page, under the heading "Dial-Up and Autodial Functions". It is an integral part of Windows Dialup Networking to this day.

"Round Robin" is a function (again, an essentially venerable but still-present-in-Windows function) of Network Services, providing for the balancing/distribution of network loads. More detail is available under the subsection Configuring Round Robin

And I gotta tell ya, partner - although I sorta pretty much had an idea of what I was looking for, I believe I haven't even thought about either term for years - I tracked down those specific, vaguely-remembered articles with simple websearches.

Oh, and in the context you appear to be following, a "Carrier" is a baseline signal on which information is overlaid; that's why its called a "Carrier" - it carries the information signal. The difference between a Constant Carrier and a Switched Carrier is just about self-explanatory; a constant carrier remains a fixed constant state, polarity, voltage, and/or frequency, while a switched carrier will "switch", or vary, state, polarity, voltage, and/or frequency.

And another "Oh, by the way ... " - my websearching turned up a few instances of you asking this very question on other websites. I'd be interested to learn how you made out.

i did do a websearch but it was along the lines of "unattended initiate modem" and so on, couldn't find anything simple at all thanks alot for the quick reply though and i also got some help from the other place i asked hehe since you brought it up.

By constant and switched carrier though I meant something else, I know constant involves point to point communication and switched involves multidrop communication, these are options in old modems. I am still unsure why it is they are necessary and how they work exactly. This material is so old that it involves more than digging to find out enough about it, it involves knowing where to look.