ports are processes' points of contact, there are four standard ports for each process:
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TCE_InPort -- a general receiving port, on this type of port requests to create a channel will be directed.
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TCE_OutPort -- a general sending port, this port is to be used to create channels between an application and the TCE kernel.
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TCE_ExcPort -- an exception port, used to create channels on which exceptions from the OS and the TCE kernel will be reported.
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TCE_NullPort -- a port used to close one or both directions on a channel.
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