Sorry for disturbing you with such problem... The problem is that when I use NET2 in my project(I have downloaded .zip source ), the compiler generates bunch of errors. All problems are of the type: error C2054: expected '(' to follow 'IP' net2sets.h, line 62 net2sets.h, line 62: [code] SETCODE(, IP, IPaddress, 10, ipEqual(a, b)); [/code] SETCODE is defined in set.h I am new to C macros... I don't know how to fix these errors. If you have time, could you please help me? because project should be done in short time. I am running on Windows XP, SP1, using Visual Studio C++ 7.0 Thank you in advance, Nasikat Tynaeva.