In FileMaker Pro we can easily create a new window and show a different table or another found set that we can work with. Since WebDirect is session based and each session is unique with each window, they do not talk with each other and therefore we can not use the same kind of technique catching information from other windows that we use in functions in FMP.
We have the popover function, but that is not the same thing as a new window.
My suggestion is that in WebDirect we have a new type of Popover that we call WindowPopover. This type is a function only for WebDirect and work in the same way as FMP. It open up a new window where we can see list of records from other table. Can do search without losing found set in background layout. It look likes a popover so that opens up from a button and hide a part of the layout in the background.
Now people will say that I can always work with portals, but that is in many ways not the same thing and also a big performance killer in many ways.