Insert into other database

Hi Fellows,

I'm wondering if in postgres we can insert a tuple into a table that is
outside of a database (I'm supossed to be connected to database1 and want to
insert a register into a table in database2).

This question is because I want to update a tables into one database from a
trigger (written in C), and the table who fires the trigger is in another
database.

I'm making the connection with SPI_connect. What can I do?? Is this
posible??

Thanks in advance,

Rodolfo Campos.