In global mode tooltip uses title values of JSF components. Placing one tooltip is enough instead of using a tooltip for each target component.
Global tooltips are smart enough and survive Ajax updates.
Source
<h:panelGrid id="details" columns="2" columnClasses="formColumn1,formColumn2">
<h:outputLabel value="First Name: "/>
<p:inputText title="Enter First Name"/>
<h:outputLabel value="Last Name: "/>
<p:inputText title="Enter Last Name"/>
</h:panelGrid>
<p:commandButton value="Submit and see that global tooltips are still here" process="details" update="details"
title="Click to submit the form per ajax" style="margin-top: 10px;"/>
<pe:tooltip global="true" myPosition="left center" atPosition="right center" header="Global"/>