I was hoping you could figure part of that out on your own... No, I was only using a variable to show you how to do it, MODEL+PATH is something like "\pboname\model.p3d", where pboname is the name of the pbo file that the file is in. In this case there is no path because its in the data.pbo, and thats the DEFAULT path (by default I mean if you don't use a path it will automatically look there). So like Planck said, its "notebook.p3d".
And yes about the //, I don't know why Planck has them there in the first place
and he should have removed them himself. You see, two slashes like that tell OFP NOT to read whatever follows it, so its usefull for adding comments, for example:
class CfgWeapons
{
// This is where we code
// the laptop addon!
class default {};
class LapTop : Default
{
scopeWeapon = public;
scopeMagazine = protected;
That text is there only for the purpose of the reader's sake, OFP ignores anything after the // marks. In our case, we WANT OFP to read the defines, so you gotta remove them.