Thanks you both for send some help. I already follow the instruction that come with the SBRelay program to get a key for use squawxbox as :
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A NOTE ABOUT FSUIPC FOR FS2004:
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You can download FSUIPC version 3 for FS2004 from http://www.schiratti.com/dowson.html
If you haven't registered FSUIPC version 3, you can use this free code that allows it to
work with SquawkBox 2.3. Start FS2004, create a flight, click the Modules menu, select
FSUIPC, click the "Register an application program" button (NOT the "Register FSUIPC"
button), and enter the following info (it's best to copy and paste):
Program name: Squawkbox
Key: LWVQ 7I2V 9GPB
(note that the character after the 7 is the letter I, not the number 1"
And I wish to know if I´m doing something wrong ?? but I guest Pet allow to use primary funtions of the FSUIPC. And yes, I´m using squawbox for online fly and with anterior versions I didn´t have any trouble , but since I install the new version that´s what happens to me ???
Maybe I should get a complete register to use that program ??