The Simple Application Messaging Protocol (SAMP) has been implemented in CASSIS.
In the menu, VO, you can :
create/connect to/disconnect from Hub
send your spectrum to an external application
.
SSAP
The Simple Spectral Access Protocol (SSAP)
has also been implemented in CASSIS.
For a step-by-step example of how to perform a SSA query, see this
pdf file.