This can be done a few ways, but the easiest is likely the Notes URL. Very similar to a web URL except it starts with notes:// instead of http://. The server reference sometimes needs to be different as well, depending on your corporate DNS. For example, sometimes notes://server.domain.com/database/0/documentunid?opendocument will work, but other times it will be just notes://server/database/0/documentunid?opendocument.
Another way is to capture the “Doc Link” info into an NDL file and just add the NDL file into the ACCESS database. If a user launches the NDL file it will work like a doc/view/db link.
NDL files are just text files formatted a specific way and saved with an extension of .NDL.