[Typo3] constant & setup in extension creation

[Pierre Rouwens]

Hi list,

I'm creating an extension i need, but i've made many "pi" files
and i have to use some constants in every of pi functions
Do i need to create a ext_typoscript_constants with my constant repeated 
for each pi or i can set up it only one time ?
i mean do i need to do :
tx_giep_agenda {
pid = 23
}
or
tx_giep_agenda_pi1 {
pid = 23
}
tx_giep_agenda_pi2 {
pid = 23
}
tx_giep_agenda_pi3 {
pid = 23
}

i hope it's clear

Thanks for all in advance

Pierre Rouwens