How to 'lock' start up apps to certain screens

[GizmoDVD]

Has anyone figured this out? I have two screens and I'd like my Twitter App to me 'locked' to open only on my second screen - not my first. It automatically opens at start up but never stays on the other display screen.

 

[leventozler]

Same with Fluid apps. The app always opens in the 'active' screen (with the active menu bar) instead of the 'last' display.

 

[tgabtg]

Turn on spaces

Launch the app

Click-hold the app in the dock

Options -> Assign To....