For a pop-up hotspot, assign property PopOver to the hotspot character format:
[HelpStyles]
Hotspotfmt=PopOver
Specify PopOver as the first property to the right of the equals sign. Additional properties can follow PopOver; see §17.7.2 Assigning properties to formats for topics and hotspots.
For a jump hotspot, you do not have to assign a property to the hotspot character format; jump is the default action for a hotspot.
When you use a cross reference for a hotspot, make sure @outputclass is applied to the reference string in the cross-reference definition. If another inline element intervenes, the PopOver property is turned off before it can be used.
When you use a hypertext link to designate character-formatted text as a hotspot, do not place any other PI markers within the hotspot area.