Does the cmdprefix only accept 1 character for its value in setting up the CA-Panvalet subsystem?

Document ID : KB000055730
Last Modified Date : 14/02/2018
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Only JES2 supported prefixes are supported to communicate with the SUBSYSTEM.  There are:
    ? . < ( + | & ! $ * ^ / % _ > ? : # @ = "
These are only one byte long.