Fills the tooltip with information about an item, quest, spell, or other entity represented by a hyperlink.
If the hyperlink is a spell link, then as of WoW 6.2, the resulting tooltip will not contain the cost of the spell. GameTooltip:SetSpellByID() will contain the spell cost, however.
Signature:
GameTooltip:SetHyperlink("hyperlink")
Arguments:
hyperlink- A full hyperlink, or thelinktype:linkdataportion thereof (string, hyperlink)