Agilent Technologies EPM-P Series Programming Manual page 292

Query
DISPlay:[WINDow[1]|2]:TRACe:FEED?
The query returns the channel of the trace currently displayed in the
specified window.
Query Example
DISP:WIND2:TRAC:FEED?
EPM-P Series Power Meters Programming Guide
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DISPlay[:WINDow[1]|2]:TRACe:FEED <character_data>
This command queries the channel
of the trace currently displayed in
the lower window.
DISPlay Subsystem
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