Conio.h

clrscr()

clears the screen.

getch()

Waits for a keystroke, doesn't echoes it on the screen.

getche()

Waits for a keystroke and prints it on the screen.

cprintf(*char)

Prints string on the screen. It can show different colors specified on the screen.
ex.
textcolor(12)
cprintf("RED");
textcolor(9);
cprintf("BLUE");

textcolor(int)

specify the text color
see color codes for help with colors.

gotoxy(int line, int column)

sends the curson to the line and colum specified.
ex.
gotoxy(35,25); //Places the cursor to bottom right of the screen

kbhit()

Checks for a keystroke. It can be retrieved using getch() or getche() or any other input function.
ex.
while(!kbhit())
{
 cout<<"..";
}
char c=getch();
cout<<c;

textbackground(int color)

sets the text background color.
See color codes also.

wherex(), wherey()

Returns the current cursor x or y position.
ex.
int x=wherex();