compaq has some software someplace that should do that for you... or maybe the microcrap intelitype software... i'm at work now, but when i get home, i'll look around...
oh wait, i have that compaq presario here with me, letme check... ok, what we need is Compaq's "Easy Access Button Support" software.
you can find it here: http://www.compaq.com/support/files/cossus.html (as of Friday 28th of December 2001)
SP8227.EXE - 119K - August 14, 1998 - ftp://ftp.compaq.com/pub/softpaq/sp8001-8500/sp8227.exe
TITLE: Presario Specific Notebook Models Easy Access Keyboard Option Pack
VERSION: 1.00 Rev A
PRODUCTS AFFECTED: Compaq Presario 1230, 1232, 1250, 1600, 1624, 1625, 1626, 1635, 1636, 1640, 1650, 1655
OS: Microsoft Windows 95, Microsoft Windows 98
SUPERSEDES: N/A
SP7681.EXE - 119K - July 6, 1998 - ftp://ftp.compaq.com/pub/softpaq/sp7501-8000/sp7681.exe
TITLE: Presario Specific Models Easy Access Keyboard Option Pack
VERSION: 1.00 Rev A
PRODUCTS AFFECTED: Compaq Presario 2253, 2254, 2255, 2256, 2266, 2410ES, 2510, 4240ES, 4910, 5010, 5015, 5015ES, 5020, 5023, 5027, 5030, 5032, 5033, 5034ES, 5035, 5037, 5038, 5110, 5115, 5130, 5137, 5140, 5147, 5600, 5610, 5612, 5620, 5635
OS: Microsoft Windows 95, Microsoft Windows 98
SUPERSEDES: N/A
SP6518.EXE - 2006K - 17 March 1998 - ftp://ftp.compaq.com/pub/softpaq/sp6501-7000/sp6518.exe
TITLE: Presario 4500 Specific Models Easy Access Button Support
VERSION: 2.50 Rev C
PRODUCTS AFFECTED: Compaq Presario 4540, 4546, 4550, 4555
OS: Microsoft Windows 95
SUPERSEDES: N/A
I'm not sure what version you'll need for the ipaq, but it is a start
Good Luck!