The view wave command's argument -title assigns a title to a newly opened window, for example:
view wave -title Adder
The assigned title is then displayed in the square brackets in the window title bar, i.e. untitled1.awc[Adder]. Window titles must be unique. An attempt to create a window with an already registered title triggers an error:
Error: Window with name 'Adder' already exists.
Windows with an assigned title can be designated by that title in subsequent commands. For example, to add more signals to a window named Adder, designate that window by using the -window argument:
wave -window Adder sim:/tb/adder/i1/*