Copy NSString to Clipboard
Coming back to the ultimate purpose of this blog... helping my memory! 
Here we are: a code snippet to copy a NSString to the clipboard...
-(void)copyToClipboard:(NSString*)str
{
NSPasteboard *pb = [NSPasteboard generalPasteboard];
NSArray *types = [NSArray arrayWithObjects:NSStringPboardType, nil];
[pb declareTypes:types owner:self];
[pb setString: str forType:NSStringPboardType];
}