You can load an application on all the computers you have. The problem is with the license of the software, activation methods, etc. If it's a free application, you can install it on all computers you have how many times you want it. The things complicate when it's used a serial number or activation methods. Many tools allow you to install only one session per serial or activated for a single machine. You will need to look into these things and then you can install the software.