There may be an occasion when you are not sure whether the program you have residing on your computer is the same as the program that resides on the PLC or simulator. You may have come into the project after development and you received a copy of the program from the previous programmer. You need to make some changes, however; you are not sure whether the programs match. Well thankfully TIA portal has a tool for that. In this lesson, you are going to learn how to use the compare tool. This tool compares the offline program, which is what is on your computer, with the online program, which is the one that resides in the running project whether that be the PLC or simulator. Open up this lesson and see how we can compare programs.