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"RL-TCPnet is designed as a stand alone TCP/IP Operating System. This means it does not need any external RTOS or File System to run. It has an integrated tiny task scheduler that manages timeouts, events, and internal tasks." Problem: Are the tasks preemptive???
Surely, RL-TCPnet is for ARM - so it's not going to work with the C51 tools anyway and, hence, the answer is irrelevant to the stated toolset!
When quoting text like this, you should always include a reference to the source - preferably a clickable link - so that people can see the full context.
From the portion you've quoted, it seems highly unlikely that it would be preemptive - but, surely, this is a question for Keil Support or Sales?
See: http://www.keil.com/forum/