When it's launching a new tab in an existing browser it's rather less overhead, and also tends to be convenient in a way nothing I've dealt with other than Tcl/

When it's launching a new tab in an existing browser it's rather less overhead, and also tends to be convenient in a way nothing I've dealt with other than Tcl/Tk is. (notably Tcl/Tk deals with remote X over ssh nicely and far too many things these days don't so much)