Have been reading the RPG features suggestion on here and was wondering if it was possible to call DarkBASIC Pro executables fullscreen, overlaying the FPS game screen. This would allow things such as levelling up characters, shop interaction and minigames such as draughts, chess, card games and other mini-games to be played such as hacing computer terminals and doors etc.

FPS Creater Classic and Reloaded are both developed in DarkBASIC, right..? So maybe it's possible to use scripting to call other programs written in the same language..?

All you'd need to do is refresh the Reloaded screen after calling and returning from the DB Pro executable.

It's certainly possible to run other applications through Lua extension plugins and I don't see any reason why you couldn't do it with DarkBASIC. That's essentially the same kind of thing I did with Omega Core and my GUI overlay for Rescue the Princess.

However, in the case of DarkBASIC as fullscreen over Reloaded, you'd just end up blocking the entire Reloaded screen in favor of the DarkBASIC screen. For both screens to be visible simultaneously, you'd need to have the DarkBASIC app use a transparent overlay window. It would also need to execute in it's own thread.

You'd need to have it fullscreen to prevent players from continuing to play the FPS/RPG whilst still in the shop/playing the mini-game/on the level up screen.

Oh, I see. You want it to block the Reloaded game. Well, then, I think you should be able to do that just fine.

would need to have reloaded release the mouse etc first though, atm even if you have a game in the background it still reacts to keypresses and the mouse is locked in the center of the screen

You might be able to send a windows command in the extension to unlock the mouse. Not sure if it would work, but it's worth a try.

I have also considered this, but after playing around with my menu maker I am not sure you can have to full screen apps running at the same time here. Especially as DB Pro is being used for both. They interfere with each other, and cause crashes. You should be able to lock the player controls in the next update, so you won't have that problem, but with Reloaded's memory issues, I think this is being a bit over hopeful.
Don't get me wrong it's just the sort of thing I want in my games I'm a big Shenmue fan! I just don't think DB running with DB is the right way to go. However I have not TRIED to run a DB program from within Lua as yet, just from with a DB program. Just doing that, it seems to be a 50/50 chance of failing to run, so wasn't much impressed. AGK would be even less suited to this.