Several comma-separated tags will be considered as logical AND between them. You can also use semicolon for logical OR. AND has a priority over OR and you cannot use parentheses for logical grouping. Asterisk (*) within a tag will be regarded as a mask for "any string".
Sections: Articles / Organization
If you are new to SVN, these are the links that should help you:
Sections: Articles / Organization
Sections: Documentation (Genoa and older) / English / Miscellaneous