The properties window displays properties of the current focused CrossStudio object. Using the properties window you can set build properties of your project, modify the editor defaults and change target settings.
The properties window is organised as a set of key value pairs. As you select one of the keys then a help display explains the purpose of the property. Because the properties are numerous and can be specific to a particular product build you should consider this help to be the definitive help on the property.
You can organise the property display so that it is divided into categories or alternatively display it as a flat list that is sorted alphabetically.
The combo-box enables you to change the properties yourself and explains which properties you are looking at.
Some properties have actions associated with them - you can find these by right clicking on the property key. Most properties that represent filenames can be opened this way.
When the properties window is displaying project properties you'll find that some properties are displayed in bold. This means that the property value hasn't been inherited. If you wish to inherit rather than define such a property then on the right click context menu you'll find an action that enables you to inherit the property.