Well, shamik, the general idea is the following.
To synchronize two actions You'd like to be synchronized as close as possible, connect Error output of one vi (IMAQ image read, for instance) and Error input of another (let it be Visa write).
Upon doing so, You'll synchrinize two actions: image read and Visa write.
As already said, this is a general idea.
Regards!
PS: Sorry if I misspelled something regarding IMAQ - just have never work with image acquisition.
