There are some basic ways to execute a command in CAD system, just like in many other applications in Windows: drop-down menu, toolbar button, Ribbon and shortcut keys such as CTRL + S for Save, CTRL + C for Copy, etc.
Sometimes, we need to select all objects or blocks with shared properties in order to delete them or count the number of a certain type of block. GstarCAD provides many ways to select objects in a drawing, among them is the very useful Select Similar Command.
By default, CAD supports operations to select objects before executing the command, so many users are accustomed to operating after selecting the graphics that they are going to edit. But this can be changed. You can execute commands first and then select the graphics to be edited.