I am doubting this statement:

Be aware that even if the App closes/exit, the hidden form remains in memory and you have to kill the application from task manager or press the stop button from the VB editor.
I would assume if you close all forms in the forms collection, it will go away (hidden or not).

Ex (in main form unload):

Code:
dim f as form
for each f in Forms
   unload f
next