syncing Identity Safe logins across 3 PCs

Hi...I'm a newbie on this board, and hope someone can give me a quick hand.

 

I have 3 PCs, all running NIS 2010.  I've been using Identity Safe for logins on all 3 of them.  But since I use these machines interchangeably, the list of logins I have saved on each one differs.  Is there a way to sync the logins across all 3 machines, so that they are all the same?  I'm hoping there is a way to do  this that gives me a "superset" of the logins on the 3 systems by not copying duplicates but keeping the unique ones.

 

Thanks!