Run programs path syntax

I'm packaging Office 2013 SP1 for deployment with SSCM 2012 R2, and I have a script located in the same "updates" directory the OCT-generated MSP file is located.

Since the SCCM will be copying all the installation files locally, I would like to know what the relative path syntax would be so the script runs from the updates directory, not from the UNC path of the SCCM source files.

Thanks