>In one particular form, I need to capture the PageUp and PageDown keystrokes and change them to Tab and Shift+Tab. I have put the code:
>

LPARAMETERS nKeyCode, nShiftAltCtrl
>DO case
>	case nKeyCode = 18	&& PageUp key remapped to Shift+Tab
**>		Keyboard "{SHIFT + TAB}"
            nodefault
            dodefault(15, nShiftAltCtrk)
>	case nKeyCode = 3	&& PageDown key remapped to Tab
**>		Keyboard "{TAB}"
            nodefault
            dodefault(9, nShiftAltCtrk)
>	otherwise
>		DoDefault(nKeyCode, nShiftAltCtrl)
>EndCase

While stufffing the keyboard generally works, specially within keypress method, it's still not entirely bulletproof - just tried using a keyboard macro which stuffs "abcdefghijklmnoprst" and had

LPARAMETERS nKeyCode, nShiftAltCtrl
IF nKeyCode%16=1
	NODEFAULT
*	DODEFAULT(nKeyCode+1, nShiftAltCtrl)
	KEYBOARD CHR(nKeyCode+1)
endif

for Keypress - it gave me "bcdefghijklmnoprstbr" instead of "bbcdefghijklmnoprrst". It did work with the Dodefault uncommented and Keyboard commented. What happened: the keyboard macro stuffs all the characters at once, and keypress reacted by not accepting the two characters (a and q) and by stuffing b and r instead in the keyboard buffer - only after the other characters were already there. While it may not hurt your case, I still think that this technique is cleaner - KeyPress processes immediately, not relying on an external mechanism such as stuffing characters in keyboard buffer.