This definition appears somewhat frequently
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Samples in periodicals archive:
The Standard Edition includes Java, PL/SQL, Perl and LIVE HTML cartridges, as well as Inter-Cartridge Exchange which provides connectivity to front- and back-end systems and allows cartridges to communicate with each other across multiple application servers.
Inter-Cartridge eXchange (ICX) -- Model for enabling fully distributed computing that allows application cartridges on any tier of the network to communicate with each other even if they reside on different machines
0's capabilities for distributed applications is Oracle Inter-Cartridge Exchange (ICX), which enables communication across cartridges.