Heres one way of doing it: Hook retrace a function that draws a circle, and make your renderstring "1RE2". If you only want the circle to draw at a certain time, make sure your hook-retraced function has an IF statement in it.

Alternatively you could read up about 'masking'

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Quote: BlaH! How do I change my password?

Sometimes a hooked script can be inconvenient. So you can do this instead.

Assuming your render string was 12E3:

SetRstring("12"); Render(); //draw first 2 layers
Circle(blah); //draw your circle
SetRstring("E3"); Render(); //draw the entity layer and layer 3

There ya go. :)

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-Hatchet