in fig4 it will be appreciated that the latches 10 10 can be flush mounted on the top rail 212 or can buried in the top rail 212 the latch 10 shown in fig4 is in a closed position indicating that the window sash 204 cannot be tilted inwardly as can be seen in the right hand latch 10 of fig4 the plunger engagement 85 engages into a channel 220 in the vertical member 222 in the window frame 210 the plunger 85 travels against the channel 220 acting as both a guide and as a positive locking mechanism to prevent inward rotation of the lower sash 204 when it is desired to tilt the window sash 204 the locking means 60 is disengaged if necessary and the handle 22 is rotated away from base 20 to the position shown in fig5 the rotation of the handle 22 will in turn retract plunger engagement 85 from the channel 220 of the vertical member 222 222 of the window frame 210 this in turn allows the lower sash 204 to pivot in on the balance shoe mechanism not shown the second latch 10 on the other end of the rail 212 is also rotated to the position shown in fig5 the lower sash 204 can then be tilted by a user engaging the handles 22 and pulling the lower sash 204.