Using Project (Altium 16.1) properties are use full to handle information that you want to change in one place but display and use every where like the Name,Revision, Date, Author and so forth.
The problem is that when you go to manufacture you have to generate Gerber for the special strings to get evaluated correctly. Just sending the .pcb file will not contain this information.
I have however found that it is possible to embed this information into the PCB through the use of components Designator and Comment string.
Noting that "" are required for it to evaluate correctly when Updating the PCB from the Schematic
Hence the information in the project is ported into the PCB as an actual string and does not need to be evaluated.
Now the PCB can be used with out needing to generate gerbers.
This is useful if the people you work with just use the PCB file and are not going to change.