Related-topic links you can produce with DITA2Go come in two flavors:
Each consists of a jump from one topic to a list of links to other topics. The listed links are members of a set of links that share a common identifier, or link keyword. KLink keywords are actually index entries, while ALink keywords are subject terms. ALink keywords are not ordinarily visible to users, except in OmniHelp (see §19.8 Providing related-topic links in OmniHelp).
ALink and KLink keywords are case sensitive. Each ALink keyword must consist of a single alphanumeric term. Punctuation is not allowed; however, spaces are allowed in ALink keywords in some Help systems.
You can generate ALinks from DITA related-links and reltables; or, you can insert ALinks in DITA XML with ALink PI markers. Use one or the other method; do not use both.
Why use ALinks and KLinks if your document already includes cross references, See also lists, and other hypertext links? Unlike other links, an ALink or KLink jump can go (via the list of links) to multiple target topics, yet does not require the presence of any topic. Therefore, you can do the following without disturbing related-topic links:
ALinks and KLinks are especially useful if you expect to merge Help projects (see §16.11 Setting up a dynamic modular Help system), for the following reasons:
If you merge your Help project with another Help project built by someone else, possibly using other tools, KLinks can provide the only way to add links to topics in the other project, assuming the other project has a thorough index.