In MWSD Star Thru is one of the few gender specific calls. Slide thru is the same motion as Star Thru, but without hands. In both Star Thru and Slide Thru, the dancers start face to face and end up side by side. In both Star Thru and Slide Thru the dancers pass Right Shoulders and Turn 1/4 Boys/Gents/Larks Turn 1/4 Right as the Girls/Ladies/Ravens Turn 1/4 left.. Many MWSD calls have left versions. For example Pass Thru (by right shoulder) and Left Pass thru (by left shoulder). Swing Thru is another. Swing thru is turn half by the left, half by the right, but Left Swing Thru is turn half but the left, then half by the right. Left Square Thru is one that starts with the left hand, BUT the dancers walk the exact same pattern as a normal, right handed square thru. In the case of a star thru and slide thru, I have never danced or called a Left Star Thru or a Left Slide Thru. I could imagine teaching it as Face your partner/neighbor, Gent use Left hand, Ladies use Right, make an arch, passing Left shoulders turn under the arch. Ladies face 1/4 right, and gents turn 1/4 left. I think the terms Left Star Thru/Left Slide Thru might work with MWSDers, but might confuse contra dancers. Perhaps at a level higher than PLUS, MWSD has a basic for the Left Star Thru. As far as your second question, the only difference I see is in the timing. OTLD Circle left 3/4 is usually done in 8 beats. If you want to shorten a swing, you could call slide left, and then circle left 3/4. I often use this with lots of new dancers allowing 4 beats for the dancers to slide and recognize their new foursome. Rich Sbardella Stafford, CT On Thu, Mar 21, 2019 at 12:57 PM Tepfer, Seth via Callers < callers(a)lists.sharedweight.net&gt; wrote: