Wireless Input and Output LINK components are key on how FlowStone does some of it's magic and can therefore never be stressed enough.
One of the main problems plaguing graphical IDEs is that of passing both data and the flow of control throughout modules nested one or more levels deep.
This is where FlowStone's Wireless Input and Output components come to a developer's rescue and is pivotal in understanding their implication when creating a sizable FlowStone project.
FlowStone allows one to wirelessly interconnect any number of modules with one another, nested any number of levels deep.
Because of it's ease at how one can liberally use these components throughout a FlowStone schematic, there is great potential of leaving behind a confusing mess to third party developers reading your schematic at a later date.
A mess that can increase exponentially with a project's growing complexity.
Using a very simple example only one level deep, we'll go through the effects of using a MGUI component inside a module with and without the Wireless Link component connected to see just how one missing Wireless Link can make all the difference to the parent module's front panel.
Step 1: Start by adding a Module component into a empty schematic:

Step 2: Step into that Module by double-clicking on it and observe it being empty:

Step 3: Now let's add a Bitmap Knob to the module by dragging one from the Toolbox into the schematic:

Step 4: Go back up a level and take a look around keeping an eye on the G button in the Action panel. We will toggle this button ON in order to make this module's front panel appear:

Step 5: Clicking on the G button will make the module's appearance change.
Our module seems to have swallowed two hollow grid squares in it's "belly":

Step 6: Now drag the Resize control located on the bottom right hand side of the module, enough so as to reveal the Bitmap Knob in all of it's splendor.
You'll notice,
we have yet to use a MGUI component:

Step 7: Here we will add a MGUI component to our module and observe it's effect on the front panel.
So step back down into the module again, by double-clicking on it:

Step 8: Drag a MGUI component from the Toolbox into your module's schematic.
It should look like this:

If you look closely in the Navigator's top level view, you'll notice our module has shrunk and seems to have chucked the knob away.
Step 9: Go back up a level so as to ascertain what has transpired in the schematic view:

Step 10: Drag the Resize control to reveal more of the module's front panel and similarly to what Houdini could have done himself, we have managed to make the knob vanish:

Step 11: Step back down into the module by double-clicking on it in order to see if we can get the little bugger back:

Step 12: Now we'll try and sprinkle some of FlowStone's magic into the schematic by dragging a Wireless Output Link component from the Toolbox into the schematic view:

Notice how the signal-strength symbol on the Wireless Output Link component's right hand side is dim and that our module's front panel in the Navigator's top view is still knob-less.
Step 13: For some people a lucky number.
Connect the View connector of the MGUI to the Wireless Output Link component and notice how it's signal-strength symbol has turned green to show it has established a Wireless connection with a Wireless Input Link we have yet to meet:

If you take a look at the Navigator's top view, you'll notice our knob is back.
Step 14: To ascertain this, go up a Level and note that it has indeed reappeared:

Step 15: Go back down inside the module again by double clicking on it, we will now try and understand why the Bitmap module reappeared:

Step 16: Go inside the Bitmap module by double clicking on it and look around to see if there's any connection between the Wireless Output Link and the reappearance of the knob on the module's front panel:

Notice how in the top left hand corner in the Schematic view, a Wireless Input Link component with it's signal-strength symbol is lit and connected to it's own MGUI component.
Step 17: We must be on to something!
Let's now disconnect the link between the Wireless Input Link and the MGUI component to see what happens:

Take a look at the Navigator's top view, our infamous knob has vanished again!
Step 18: Go back up a level to ascertain this:

Step 19: Step back into the Bitmap Knob component and re-establish the connection we had undone:

Now if you look at the Navigator's top view, that son of gun knob is a back again.
Step 20 and final step: Go back up to the top level of the Module's schematic and note how the knob is indeed there, back where it belongs:

The simple example given above used a MGUI component because of the obvious visual implication such a component can demonstrate in any context.
The same reasoning would apply when creating Wireless connections up and down a schematic using any appropriate FlowStone component in a more complex module.
If you keep in mind how the flow of both data and control throughout a FlowStone schematic relies heavily on Wireless Links and apply the same discernment when using them inside a schematic, including adding some comments within a Text module regarding where and how far up or down the schematic your wirelessly connected module is located, will likely alleviate most of the mystifing behavior plaguing a defective module for you or a third party trying to figure out later on down the road how your creation works.
'Hope this helps.
Cheers