1.Start
2.scan the key
3.wait for 20-50 milliseconds
4.scan the key again
5.if key is not still down goto step 7
6.store and process the key
7.exit


The pseudo code should be like this ?
===============
KeyScan:
1.Start
2.scan the key
3.If not down goto step 7
4.Wait for 20-50ms
5.key still down? If not goto step 7
6.excute keydown statements
7.exit

Call KeyScan every 100mS or as required.
================

Raghu