Thank you all for your suggestions

@graff: the two (GUI) applications are two different piece of software doing two different things. They are generally used indipendently from each other. As things grow up, I notice they could share some data. Example: App1 is an interface to a SQlite database. Just managing various data. App2 elaborates statistical alalysis from texts. Just thought it nice, if I could "bring togheter" the two things: For example doing some statistical data in App2 starting from a query result in App1.

By now I think the easiest thing to do is use a exchange-database or something like that, as suggested in a reply.