TRANSFER- The strong hand should receive the lead 

1- Transfer after 1nt opening
Opener Responder
 1nt       2  <= transfer to 2
             2  <= transfer to 2
             2  <= transfer to 3 with pre-accept (3=I Like / 2nt=no)
             2nt <= transfer to 3 with pre-accept (3=I Like / 3=no)
             4  <= Gerber asking for aces (4=0/4, 4=1, 4=2, 4nt=3)
             4  <= transfer to 4 more weak than first transfer to 2
             4  <= transfer to 4 more weak than first transfer to 2
             4  <= transfer to 5
             5  <= transfer to 5

2- Transfer after 2nt opening
Opener Responder
 2nt       3  <= transfer to 3
             3  <= transfer to 3
             3  <= Stayman for minors (3nt no minor 4 cards)
             4  <= Gerber asking for aces (4=0/4, 4=1, 4=2, 4nt=3)
             4  <= transfer to 4 more weak than first transfer to 3
             4  <= transfer to 4 more weak than first transfer to 3
             4  <= transfer to 5
             5  <= transfer to 5

3- Considering that the strong hand must receive the lead after a minor opening in level 1 a response bid at level 4 in 4 is a transfer to 4 and a response bid in 4 is a transfer to 4, in both cases showing 7/8 cards limited up to 10 hcp in good suit like: AK109xxx; AQJxxxx; KQJxxxx; KQ109xxxx; QJ10xxxxx+(A or K in other suit) with maximum 1 ace:
Opener Responder
 1        4 <= transfer to 4
 1        4 <= transfer to 4
 1        4 <= Gerber asking for aces (4=0/4, 4=1, 4=2, 4nt=3)
 1        4 <= transfer to 4
 1        4 <= transfer to 4
 1        4 <= Gerber asking for aces (4=0/4, 4=1, 4=2, 4nt=3)

5- Transfer is also on after interference
Opener Overcall Responder
 1nt        2          4  <= transfer to 4
 1nt        2          4  <= transfer to 4
 1nt        2          4  <= transfer to 4
 1nt        2          4  <= transfer to 4
 1nt        2          4  <= transfer to 4
 1nt        2          4  <= transfer to 4 
After interference if response is in jump to level 4 is a transfer
 1         1          2  <= support in Clubs and invitation with 10-11 hcp
 1         1          3  <= asks for partner bid 3nt with Diamonds stopper
 1         1          4  <= transfer to 4
 1         1          4  <= transfer to 4
 1         1          2  <= support in Clubs and invitation with 10-11 hcp
 1         1          3  <= asks for partner bid 3nt with Hearts stopper
 1         1          4  <= transfer to 4
 1         1          2  <= support in Clubs and invitation with 10-11 hcp
 1         1          3  <= asks for partner bid 3nt with Hearts stopper
 1         1          4  <= transfer to 4
 1         1          2  <= support in Diamonds and invitation 10-11 hcp
 1         1          3  <= asks for partner bid 3nt with Diamonds stopper
 1         1          4  <= transfer to 4
 1         1          2  <= support in Clubs and invitation with 10-11 hcp
 1         1          3  <= asks for partner bid 3nt with Spades stopper
 1         1          4  <= transfer to 4

6- What is not a transfer and the use of 2nt for transfer to 3
 1nt        2          2  <= this is Diamonds suit sign-off not transfer to 2
 1nt        2          2  <= this is Hearts suit sign-off not transfer to 2
 1nt        2          2  <= this is Spades suit sign-off not transfer to 3
 1nt        2          2  <= this is Hearts suit sign-off not transfer to 2
 1nt        2          2  <= this is Spades suit sign-off not transfer to 3
 1nt        2          2nt <= this is transfer to 3 sign-off not invitation to 3nt
 1nt        2          2  <= this is Spades suit sign-off not transfer to 3
 1nt        2          2nt <= this is transfer to 3 sign-off not invitation to 3nt
                                  and may be corrected by Responder bidding 3
 1nt        2          2nt  <= this is transfer to 3 sign-off not invitation 3nt
                                  and may be corrected by Responder bidding 3 or 3
 1nt        2          3  <= this is Diamonds suit not transfer to 3
 1nt        2          4  <= this is transfer to 4 (in jump is transfer)
 1nt        3          3  <= this is Diamonds suit GF not transfer to 3
 1nt        3          3  <= this is Hearts suit GF not transfer to 3
 1nt        3          4  <= this is Diamonds suit just competing not GF
We apply here the Lebensohl convention and after interference in 1nt  system is off, so the transfers at level 2 are off but at level 4 are on.

7- After an open bid in a major suit and a takeout double when Responder strength is 6-9 hcp Responder makes a transfer to show his 6+ card suit bidding 1nt/2/2:
Opener Opponent Responder
  1        double    1nt (trf)  <= shows 6+ and 6-9 hcp
  1        double    2   (trf) <= shows 6+ and 6-9 hcp
  1        double    2   (trf) <= shows 6+ and 6-9 hcp
  1        double    2   (trf) <= shows 3 and 8-9 hcp
  1        double    2           <= shows 3 and 6-7 hcp
  1        double    1           <= 5+ and 6-9 hcp
  1        double    1nt (trf) <= shows 6+ and 6-9 hcp
  1        double    2   (trf) <= shows 6+ and 6-9 hcp
  1        double    2   (trf) <= shows 3 and 8-9 hcp
  1        double    2           <= shows 3 and 6-7 hcp
    
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