We overcall

with two suited hands

(1♣)

2♦    =    ♥♠

2NT    =    ♦♥

3♣    =    ♦♠

(1♦)

2♦    =    ♥♠

2NT    =    ♣♥

3♦    =    ♣♠

(1♥)

2♥    =    ♣♠

2NT    =    ♦♠

3♥    =    ♣♦

(1♠)

2♠    =    ♣♥

2NT    =    ♦♥

3♠    =    ♣♦ 

INT promises 6 LT at most when identical vulnerability and on level 3 - adjusted otherwise.

FOL invites with good fit and if she can cover 2 LT  (in side suits only Aces count)). Invitation is shown by cheapest bid, which wouldn't show a fit). INT rejects the invitation by bidding her lower suit, all other bids are GF, however INT si not allowed to bid above 3NT. Logical continuation (3NT/4M = TP, 4m = SI). 

FOL's doubles are for penalty.

Except 2NT, system on on pass out position.