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Tells the director which slot the guest should prefer to be in
&slot=Nis a guest side property (sender side). It just tells the director (Mixer App /
&slotmode) which slot the guest should prefer to be in, if slots are being auto-assigned. If the desired slot is already taken, then that guest will then not be assign a slot. If the guest was assigned a slot by the director, refreshing will keep the assign slot, and the URL-specified slot preference will be ignored.