Stupid question could be percieved as stupid... what do I use to do "GetKey"?

sorry, I meant in C.  Figured it out btw, isKeyDown().

Edit:  I think this thread might become my Ndless Question/Help thread (moreso C).  If someone wants to move it, that's fine.

Should this code work?  It should darken the screen, wait for you to press ESC, and quit.
#include <os.h>
#include "utils.h"

asm(".string \"PRG\"\n");

int main(void)
{
    int A;
    int B;
    for (A=0;A>319;A++){
        for (B=0;B>240;B++){
            setPixel(A,B,0xF);
        }
    }
    while (!isKeyPressed(KEY_NSPIRE_ESC)){}

    return 0;
}


You need to change the for loop conditions to A < 320 and B < 240. With that said, here are some tips:
(1) You probably want to examine the first post in the Routines sticky for useful routines. I recommend skeleton.zip if you don't have it already. It has an extended os.h and utils.h with more functions and keycodes. It's also smaller, which makes for cleaner uploads.
(2) C style dictates that your variables should be in lowercase, with constants in uppercase.
(3) while(!isKeyPressed(KEY_NSPIRE_ESC)); works (note no braces!)
(4) For sake of readability (at least in my opinion), it is a good idea to make your hex numbers have leading zeroes (so use 0x0F instead of 0xF).
Congratulations on having written your first Nspire program! Welcome to the wonderful world of Nspire programming

You should use screenbuffers when you have any animation. For still images, or just text, its fine not to.

To allocate one, use:
char* scrbuf = (char*) malloc(SCREEN_BYTES_SIZE);and put scrbuf in function arguments.