Use a character or paragraph format to define a hotspot for a jump to a secondary window, and assign the window name to that format:
[SecWindows] ; doc format = name of secondary window to use for jumps from ; within the span marked by this format (same as WinHelp usage) ProcWindow = procwin
See §16.7 Jumping to secondary windows in Help systems. The window name popup is reserved for pop-up windows.