What are ini files
Ini files are files with a "ini" extension. They are usually used to store configuration information for either windows or other applications. Although, you can use them to save all information you want to.
Note that you should not write to an ini file activly used by mIRC (e.g. mirc.ini).
The basic structure of an ini file is:
[topic1] item1=data item2=data .... [topic2] ....
Note that, because of this structure, you cannot use all characters in topics. For example, "[" and "]" aren't allowed.