Window with no title bar in Linux?

[Bob Warren]

Gilberto Cuba showed me how to remove the title bar in Linux. It's 
incredibly simple and makes sense:

After setting the decorations to empty, in the stack's properties ("Size 
& Position"), uncheck "Resizable".

That's it! (Makes me feel a right twit**.)

Thanks very much Gilberto.

Now, if somebody can tell me how to set the top of the window to a 
negative value in Linux, that'd put the cherry on top of the cake!

Bob

** Together with "yonk", "twit" or "twot" was also part of my London 
vocabulary when I was a young man. I imagine that among people who 
emigrate, "frozen" vocabularies like this are quite common. These cannot 
be current terms, can they?

(Note also "right" used as a synonym of "real".)

By the way, twit = idiot (I nearly typed "twip" there: I must have M$ on 
the brain!) That reminds me of "twerp" ....OT...Stop