IP/Terminal Name

I want to store user machine IP and MACHINE NAME into my log table. Is there any procedure, function, property or any other way to get it.
Please reply me.

Thanks
SAAD N. SIDDIQUI

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Select Sys_Context('USERENV', 'TERMINAL') "Machine Name", Sys_Context('USERENV', 'IP_ADDRESS') "IP Address" From dual
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check Sys_Context function...