I am on a quest for a lost secret of ancient wisdom! (LOL) I asked in two grids already, InWorldz and OSGrid, but no-one knew. It's simply what the title says: how to use the reference ruler. To use the reference ruler a reference prim must be chosen with some key combination, but I can't remember what it is.
It's not present in
http://wiki.secondlife.com/wiki/Building_Tools . Someone in OSGrid claimed Cool Viewer chooses the reference prim when reference ruler is selected from the drop-down, (the one with 'world' and 'local' too,) but it's not doing that for me. (If it did, it wouldn't be good anyway.)
So, what's the key combination, please?