portable variables how to use?

When you make a backup job fo example sometimes you need to backup directories that found on your USB, and on different computers the USB drive letter may differ.

So how could you enter the path to that directory if the path may differ?

Here comes the part of the portable variables, you can define different paths (depending on the computer name) for one varible-name. In my example you will use the @drive@ variable to indicate the USB drive letter (to be precise it's something like "F:\" without the quotes).

The source and destination boxes are where you enter the paths required for the sync operation, and same for the two boxes in the backup tab. The "..." buttons on the right allow you to select a file or folder, depending on what is required, and the bigger adjacent buttons allow you to add portable variables.

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You can use Toucan from the command line but it's unassociated to the portable vars, here's a copy of the explanation from the help documents:

Please note that the Toucan.exe file in the folder Toucan/App/toucan 
should be used rather than its launcher in the root directory. 


Sync
Usage: 
Toucan  Where  is the name of a previously saved 
Sync job, you can save these from the GUI. Toucan will run the job and 
then exit without loading the graphical user interface.  If there is 
a space in the job name you will need to wrap it in quotes.


Backup & Secure
Usage:
Toucan   Where  is the 
name of a previously saved Secure or Backup job and  is the 
password that you want to use . Toucan will run the job and then exit 
without loading the graphical user interface and will output its progress 
to the command line. If there is a space in the job name you will need 
to wrap it in quotes.

If you still confused just ask again...

And here's my question:

Is there any way to use Toucan Portable Variables
in my own .bat files?