  We consider the general theoretical framework to study exclusive double
diffractive events (EDDE). It is a powerful tool to study the picture of the
$pp$ interaction. Basic kinematical and dynamical properties of the process,
and also normalization of parameters via standard processes like the exclusive
vector meson production (EVMP), are considered in detail. As an example,
calculations of the cross-sections in the model with three pomerons for the
process $p+p\to p+M+p$ are presented for Tevatron and LHC energies.
