Polycom RealPresence Group Series Reference Manual page 107

Convention
{a..z}
"x"
Although the API command parser may accept the minimum number of characters in a command that
makes it unique, you should always use the full command string.
Polycom, Inc.
Meaning
A range of possible alphanumeric values is enclosed in braces.
Example: abk letter {a..z} shows that the abk command can be used
to return address book entries that begin with an alphanumeric character in
the range specified.
Example: camera near {1..4} shows that the camera command can be
used to select Camera 1, 2, 3, or 4 at the near site.
Quotation marks indicate strings to be supplied by the user. You do not need
to enclose the value in quotes unless it contains a space.
System Commands
116