Undocumented Netscape Tags

A list of undocumented or not-too-well documented tags that are available in Netscape 4 (some of them are also available in Netscape 3 where noted):

image
Works the exact same as the <img> tag. Also available in Netscape 3.
subdoc
Unknown.
cell
Not sure, seems to add a caption to a table. In Netscape 3, just messes up the table.
hype
Also available in Netscape 3. No closing tag is required. Embeds the sound about:hype ("What is global hypermedia") like so:. This tag does not work in MS Windows versions of Netscape.
certificate
Not sure, but in Netscape 3 the text between the opening and closing certificate text isn't displayed.
mquote
Not sure.
spell
Used to tag mispelled words (and yes, I did misspell misspell). The words are underlined with a pink dashed underline.
inlineinput
Adds a black dashed underline.
server
Specifies server-side Javascript. No idea as to why this tag is required on the client, particularly since it doesn't seem to do anything there.
jean
A Netscape developer who wanted to immortalize himself in a tag? Don't know what this one does.
charles
Like the <jean> tag, I don't know.
nscp_open
Don't know.
nscp_close
Don't know, but it seems to act like <nsdt>.
nscp_reblock
Don't know.
nsdt
Works like a <dt> tag, except it doesn't support the compact attribute.