LispWorks for Windows has, by default, a single window MDI interface, shown below in MDI Interface in LispWorks for Windows.
This MDI option is the default, but the multiple window interface (familiar to users of LispWorks for Windows 4.1 and LispWorks on other platforms) can be selected using the Tools > Preferences... menu command.
Figure 1.2 MDI Interface in LispWorks for Windows
Even though the MDI interface is the default, this manual will usually show single windows in figures in order to show more detail for the specific LispWorks tool under discussion.
LispWorks IDE User Guide (Windows version) - 25 Nov 2011