Product assignment using mql

Hello All,

I'm trying to understand the use of product assignment from the MQL,

I saw two way's one  

"modify product XEN add person testUser" ;

another one 

"modify person testUser add product XEN";

do you know what are the difference in both the options and which one we have to use if we have shared product licenses ?



thank you,

Shailesh Kanoongo.