(1) The strange little gray triangles just above the text-area submission box:



	During each CodeLab session, CodeLab maintains a "history" of
	your submissions for each exercise. You can go backwards and
	forwards in this history using the above buttons.

	This is useful if you've made several erroneous submissions and
	decide that you want to go back to a previous submission and
	resume your work from there.


(2) Seeing the output of your submission.

	If your submission writes to "standard output", then
	CodeLab will display an "Output" subsection (with its
	own green open/close triangle) in the RESULTS tab.

	Keep in mind, most CodeLab exercises do not involve writing
	to standard output. But if you get stuck on a problem and
	want to see the value of a variable at some point, you can
	insert a statement that writes its value to standard output
	and thereby see a bit more about what's going on.

	Suppose, for example, the exercise is to write a statement
	that puts twice the value of x into y. Instead of writing
		y = 2*x;
	you write
		y = 3*x;
	(Yes, this is ridiculously lame, but it's just an example.)

	If you couldn't understand why the code was rejected and
	wanted to see x's and y's value you could add:
		System.out.println("x="+x+" y="+y);	// Java
		cout << "x="<<x<<" y="<<y<<endl;	// C++
		printf("x=%d y=%d\n",x,y);		// C

	This would cause the Output TAB to appear and you could
	see more about what your code is doing.

	WARNING: You will have to delete or comment out your
		output-displaying debug statements in order to get
		your code accepted: debugging output is NOT part of
		the specification!


(3) Correcting Your Email Address.

	If you registered using an email address that is invalid, or if
	your email address has changed, click PREFERENCES and change your
	email address under the ACCOUNT INFO section. If your email address
	is not valid, we will not be able to reply to any feedback from you
	or alert you to any issues by email.

	Keep in mind that, Turing's Craft will never provide your email
	address (or any other personal information) to any third party
	other than your instructor.

(4) Automatic Advancement.

	You can arrange to jump forward to the next exercise automatically
	when your submission is correct.  Click PREFERENCES and check the
	checkbox on the far right.

(5) Hide or Widen the Table Of Contents

	You can hide or expand the width of the  table of contents (TOC) by
	clicking down on the two thing vertical lines on the right side of
	the TOC, and holding down and dragging left or right.