=> R0 = Character code.
<= R0 corrupt
This call has two uses:
1 : Pass on keypresses that your program has received from Wimp_Poll reason 8, but doesn't use.
2 : Insert keypresses into the Wimp buffer.
Note 1 : Before RISC OS 4, you should not insert more than one or two characters at a time this way. It seems that the Wimp gets confused after that.
Note 2 : Characters inserted this way takes precedence over characters in the keyboard buffer.
See PRM 3, page 173.
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