Apps for all users on an XP domain comp

OK, the answer is probably right in front of my face. How can I make available all the apps I?ve installed on the XP Pro computer under an admin login to all of the Domain Users who logon to that computer? I?ve tried to set a Group Policy up on the local, but it doesn?t seem to work all the time. Some programs I?ve installed are available to Domain Users, but most are not. What’s with that???