It is the follow-on product to IBM 4680 OS, which had been in use by IBM's customers since 1986.

However, nothing prevents a company from developing follow-on products that are backwards compatible with its own early products.

Notes-11 and its follow-on product, VAX Notes, were two of the first examples of online collaboration software, a category that has become to be known as groupware.

Cairo, Microsoft's follow-on product to Windows NT, is expected in late 1995, and will incorporate object-oriented programming - a possible blow to Nextstep.

Aftermarket (also after-market) refers to any market where the customers who purchase one product or service are likely to purchase a related, follow-on product.

Unlike most software companies, Intuit treats services and follow-on products, like check-writing and credit cards, as core products right along with its software.

The follow-on product targeted for the family room was code named "Mannix".

I.B.M., as Mr. Campbell-Kelly explains, did the same thing with its operating system for the I.B.M. 360 mainframe and follow-on products.

"While they have in some sense blazed a trail through the regulatory thicket, it isn't going to make the path of the follow-on products that are alive any easier."

Aftermarket (merchandise), any market where customers who buy one product or service are likely to buy a related, follow-on product.