I would encourage you to work with a partner.  One might even already be tied to your account.  You could ask Sage. 

This is a known issue, window focus. Is your Sage 100 system already implemented by Sage or a Sage partner?  There are a number of configuration items that are best setup by a pro.  That is of more importance if you're implementing beyond GL, AP and AR. 

Modify ForegroundLockTimeout Windows Registry key for each remote user:

1. Go to Start, Run
2. Type Regedit
3. Browse to the Windows Registry key: HKEY_CURRENT_USER\Control Panel\Desktop\
4. Double-click ForegroundLockTimeout
5. Enter 0 in the Value Data field (leave as Hexadecimal)
6. Click OK and exit Registry Editor
7. Repeat steps 1 thru 6 for each remote user session

Thank you for your response.  I tried it but it didn't work. 

It's a Windows setting, requiring a reboot to become effective.

Be VERY careful with it though.  It forces all pop-ups to the front.  If you're typing away, and a dialog shows up to "delete all your important files Y/N" at the moment you happen to hit the space bar, you just agreed to the deletion without even a chance to read it.