I don't think there is a technical reason to keep web dispatcher SIDs unique, unless they are sharing the same host. I like keeping them unique to avoid any possible confusion. (I do the same for the diagnostics agents.) I also like to keep the names similar to the systems they are dispatching for. For instance, I have a portal landscape with development (EPD), test (EPQ) and production (EPP). The corresponding web dispatchers are EWD, EWQ and EWP, so I can tell just by the name which portal system they are serving.
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