The only way to get the slider back in is to remove the tiny screws that hold the tracks in place. If they are like most of that vintage, they are probably ready for renewal anyway. the hardest part is actually find the screw head, so take an awl or ice pick and slide it down the tracks, upper and lower till it drops into the screw head. Sometimes, they used tiny phillips head screws, and I have also seen slotted screws.
The knobs you speak of sound like the window locks, they turn 90 degrees, the pop outward to allow the window to open. You may need to spray them with liquid wrench, PB blaster, or other penetrant before they work again.
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