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This non-terminal command has sub-commands for setting and querying the
three intrinsic construction components: foreground,
background and extension. See Constructions. All
commands in this hierarchy applies to the selected construction. If the
mouse selection is pointing to nowhere when any command of this
hierarchy is invoked, it displays ‘SELECT CONSTRUCTION’ on the
message line and sets the mouse cursor to UNAVAILABLE
.
Otherwise, the mouse cursor is set to LINK
, unless an input
command is applicable, in which case it’s set to QUESTION
.