How to run a command line during runtime?

Hey guys, I remember there was a way to run command lines during runtime without having to execute an external program... but I've been looking for hours and can't find it.

The only way I can achieve it now is by executing the "game.exe" itself either with the file object or the special conditions and then running the command line, but this creates 2 instances of the game running, so I have to end the 1st application.

But I'm pretty sure I used to be able to do it without closing the game or executing an external file. I might be wrong, can someone please guide me or correct me if I'm wrong?

I'm talking specifically about these commands:

/DIB => forces standard graphic mode
/DIB3 => forces standard graphic mode, 256 colors
/DIB4 => forces standard graphic mode, 16 millions of colors, 24 bits
/DIB6 => forces standard graphic mode, 32768 colors
/DIB7 => forces standard graphic mode, 65536 colors
/DIB8 => forces standard graphic mode, 16 millions of colors, 32 bits
/DDRAW => forces DirectDraw + VRAM mode
/NOVR => no VRAM in DirectDraw mode
/DEBUG => displays graphic mode in title bar
/MIS0 => disables the Machine Independent Speed option
/MIS1 => forces the Machine Independent Speed option
/NOF => runs in windowed mode
/NOC => prevents images from being compressed in memory (for internal test)
/NOX => disables Alt+F4
/VSYNC => forces V-Sync ON

You are right, it will probably crash. It's just that it was bugging me that I could not find a way to run a command line without running a new instance of the game because I'm pretty sure I had done it before.

I guess I'll have to compromise and restart the game every time a player changes specific settings.

Your extension sounds interesting, where can I find it?