Agilent Technologies 54621A Programmer's Manual page 57

Programming and Documentation Conventions
The Command Tree
Example 2:
OUTPUT 707;":TIMEBASE:REFERENCE CENTER ; DELAY 0.00001"
or
OUTPUT 707;":TIMEBASE:REFERENCE CENTER"
OUTPUT 707;":TIMEBASE:DELAY 0.00001"
or
OUTPUT 707;":TIMEBASE:REFERENCE CENTER; :TIMEBASE:DELAY
0.00001"
In the first line of example 2, the subsystem selector is implied for the DELAY
command in the compound command. The DELAY command must be in the
same program message as the REFERENCE command, since the program
message terminator places the parser back at the root of the command tree.
Example 3:
OUTPUT 707;":TIMEBASE:REFERENCE CENTER; :CHANNEL1:OFFSET '0'"
The leading colon before CHANNEL1 tells the parser to go back to the root of
the command tree. The parser can then see the CHANNEL1:OFFSET
command.
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