RemDim (Remainder Dim) is a feature I've loved since 1980. Some consoles use the word "solo" to accomplish the same task....Remdim? Really what the hell does that even mean...
[user]Gafftaper[/user], see page 279 of your OSv10 User's Manual for the Palette. Or page 225 of the older (modern) Light Palette Manual.
If you really want to get confused, look-up Highlight and Lowlight in the Strand Manuals. These features will be coming to the ETC Eos/Ion in v1.4.