Each copy of the software will activate on only 2 computers. So if you want anyone to work at home and also at school, you have to count up how many different computers you will want to load the software onto. If it's more than 2 - you'll need a site license CD. You can order each additional copy of the CD for $15 apiece and each of those in turn will only open on 2 computers. So if you have a total of 4 staff members (including you) and each wants to use the software at home, plus you wish to also load it onto a computer at the center, you will need the initial CD-ROM ($69.95) plus a site license for 2 other copies ($15 + $15) plus shipping and handling of $3.95.