=> R0 = new colour 1
R1 = new colour 3
<= R0 = old/current colour 1
R1 = old/current colour 3
This SWI sets or reads the colours of the hourglass. To read the existing value without changing it, specify the colour as -1. To change the colour, specify it as &00BBGGRR (it's different to the ColourTrans palette entries).
Colour 1 default is cyan, colour 3 blue.
See PRM 2, page 742.
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