OK, you got two viewpoints so far. I'll step behind the scenes.
To figure out what you have to work with,
I'm trying to force an MS-Access form to take a certain position relative to the right edge of the main window (actually I want to center it, but I can see also wanting to dock it to one side or an...
stackoverflow.com
From there, remember that the "anchor point" in Access is the top left corner, which is to say (top=0, left=0). So you can set the form's position to the far left as 0, but to set it to the bottom of that area, you must take the bottom as determined from the parent window size and subtract the form's height to place the form vertically at the bottom of the window.