I am a little confused by your question. First you mention transferring Apps then you mention iPhone & iPad. Potentially, you could mean transferring Apps from an old Mac or just getting the Apps off of an iPhone/iPad. I'll tackle each separately.
First, if you are wanting to Transfer Mac Apps, you could use the Migration Assistant. That can transfer all your Applications, support files, and data files from your old machine. Click on the magnifying glass in the upper right corner and type "Migration Assistant". You will find the App in the Spotlight results. Open MA. Follow the process to do the transfer. When done with that transfer, you may need to log into the Mac App Store and login using your Apple ID that you used to perviously to purchase the Apps.
That is the hard one, now for the easy one.
If you are worried about getting the Apps off of the iPhone/iPad, it is a little more straight forward.
1. Open iTunes.
2. Login using the Same Apple ID that you used to purchase the Apps on the iPhone/iPad.
3. Plug in the iPhone/iPad and Sync.
The Apps will get backed up to your machine.
Hope that helps.
I just bought a new macbook air. I used migration assistant and was able to transfer all of my software, however nothing came from itunes or any of my other folders.
I was able to transfer my music through homeshare but not my apps.
Is there something that I'm missing when doing the migration assistant?
Well the Apps are located in the following folder.
User Folder/Music/iTunes/Mobile Applications/.
BTW. User Folder is the folder that has your Documents, Music, Movies Folder, etc. My guess is your home folder would have a name of staceyj.
You could share your old machine and copy them over. I am not sure that would be enough. Doesn't syncing the device(s) on the new machines, while logged into iTunes using the same login that the Apps were purchased with, bring the Apps over? I thought that would.