1NT Forcing
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The Response of 1NT to a major suit opening is used to 
show a hand that is not good enough to bid a 2 over 1.  

Opener must make a rebid.  Opener makes a natural rebid, 
but lacking a four card second suit, opener rebids a 
three card minor (prefering 2C if opener has both) or 
rebidding 2H if exactly 4522 without reversing strength. 

Responder makes a natural rebid:  taking preference to 
the suits opener mentioned, or bidding their own suit---
this shows a 6+ (but could be 5 if the heart suit) card 
suit.  A jump by responder shows a hand that is almost 
good enough to bid a 2 over 1 (about 9 to 11 points). 

Examples:

	1H	1NT (1)	(1) forcing one round
	2H (2)  3H (3)	(2) 6 hearts, minimum hand
	4H 		(3) at least 2 card support, 10-11
				
	1S	1NT
	2H (1)	3H (2)  (1) 4 hearts, denies 6 spades, minimum 
	4H  		(2) 4+ support, inviting 

	1S	1NT
	2D (1)	2S (2)  (1) 3+ diam, denies 6 spades and 4 hearts, minimum
			(2) simple preference to spades 

	1S 	1NT
	2D (1)	2H (2) 	(1) 3+ diam, denies 6 spades and 4 hearts, minimum
			(2) 5+ hearts, minimum

	1S	1NT
	2C (1)  2D (2)  (1) 3+ clubs... 
			(2) 6+ diamonds, minimum 
	
	1S	1NT
	2C (1)	3D (2)	(1) 3+ clubs...
			(2) 6+ diamonds, almost enough for a 2/1

	1S	1NT	
	2C (1)	2NT (2) (1) 3+ clubs...
			(2) balanced 9-11, denies 5+ hearts, 3+ spades  

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NOTE:  Over 1H, some people reverse the meanings of 1S and 1NT.  
	Then, 1S is forcing one round--- opener can now rebid 1NT
	with a no trump type of hand and 2 of a minor would 
	guarantee a four card suit.  1NT would show 4+ spades and 
	6+ hcp.