Zend, Ioncube, Eaccelerator ?'s


I transfered the domain that my name servers will use and while I wait for that to go thru thought I'd start to tweak my VPS.

It appears that Zend is installed. Some Joomla addons require Ioncube and it seems eaccelerator is highly recommended. Will these co-exist?
I don't know what eaccelerator is, but the Zend Optimizer and IonCube can be installed concurrently without issue.