Markers are areas (sometimes known as "regions" in other data analysis software) that you set on a 1D plot (histogram). Markers are accessed by selecting the Gating (or Home) tab→Create Gates→Create Marker command and subsequently drawing a marker on a histogram of interest.

 

Markers may be:

Created on any histogram

Adjusted and moved manually

Resized manually

Linked to other marker endpoints from the same or different plots

Linked to any token value

Locked to a specific position/value