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From FenixWiki

Definition

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key(); is a function that needs a constant or a variable with the scancode or the scancode itself for the key you want to check. The variable ascii shows the scancode of the key currently pressed. This function returns 0 or false if the key is not pressed, 1 or true if it is pressed.

The constants for the keys commonly start with _ + the key. So if you want to check for the letter 'a' to be pressed, you would pass _a to key();.

You can find a list of the constants and scancodes here.

Example

program input_test;
 begin
   set_mode(320,240,16);
   set_fps(60,0);

   while( !key(_esc) )

     delete_text();

     if( key(_left) && !key(_right) )  
       write(0,160,120,4, "LEFT");
      end;
     
     if( key(_right) && !key(_left) ) 
       write(0,160,120,4, "RIGHT"); 
      end;

     frame;
    end;

   exit();
  end;

This will output the words LEFT or RIGHT according to the keys you press, or it will quit the program once ESCAPE is pressed.