In the standard affiliate link code we provide, the target="ejejcsingle" just determines that link should open in a new window/tab, as any target= attribute would typically do.
The difference between this and target="_blank" is that the latter opens a new window every single time any such link is clicked (so even if you click the same link multiple times and never close the new window, you'd spawn yet another new window for each click). Giving the target window a specific name, such as target="ejejcsingle", will open just one new window, and every link with the same target name will load in that same new window. Since all our affiliate links use the same target name, you could have multiple links for various affiliate programs on your page, and all of those links would re-use the same new window while leaving your page open in the original window.
