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is it necessary to register mIRC? when I get connected, sometimes the mirc reg page pops up. any advice? thanks.

If you plan on using mIRC quite frequently, you should be considerate and register your copy. But, to answer your question, it is not necessary to register the program, as it will operate at full capacity. Periodically you will see a registration screen pop up to remind you to register (this of course will go away once you register and input the correct code).