This function allocates a TCP stream, and does an active open to the specified destination. It returns immediately, before the connection is actually open. TCPState must be called to determine when the connection is actually open and useable. A connection ID is returned, which can be used in subsequent TCP calls.
NOTE: You MUST call TCPRelease to free up the buffers associated with the connection before exiting HyperCard. If you don't do this, strange and mysterious crashes will occur after you've quit HyperCard.
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address of remote machine
port number on that machine
local port number (zero to have one assigned automatically)