Getting Undefined Function error in MS Access

I have an MS Access 2010 application that I deploy as an accdr file along with Access 2010 runtime.
At startup in this application I need to determine if the application is being run by someone remotely on my Terminal Server.  The computer name of the terminal server is "RDS01"
The line of code to check this is as follows:

         If Environ("computername") = "RDS01" Then

When the application is run on any computer other than my Terminal Server the line executes properly, determining the name of the computer.
But, when the application is run on my Terminal Server this line of code fails with the following message:

      Undefined function 'Environ' in expression

Can someone tell me why this is happening?
dsoderstromAsked:
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DatabaseMX (Joe Anderson - Microsoft Access MVP)Database Architect / Systems AnalystCommented:
Is the DB in a Trusted Location ?
And meanwhile, I suggest you not use Environ() and instead use the standard Windows API call - which will not have this issue:

Get Computer Name
http://access.mvps.org/access/api/api0009.htm

mx
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
<<Can someone tell me why this is happening? >>

 More than likely, the bane of VBA code writers; a broken reference.

 VBA relies on a reference list (with the VBA editor open, tools/references).   If a reference is "bad", than the VBA project won't run.

 What you'll need to do is add code like that found here:

IsBroken Property [Access 2003 VBA Language Reference]
http://msdn.microsoft.com/en-us/library/office/aa196149%28v=office.11%29.aspx

 or get a full install of Access on there with a DB not in runtime mode.

 You also might be able to figure it out from the reference list.  Look for non-standard ones you may have used.   If your lucky, you haven't used them in the app and can un-check, compile, and save and you'll be set.

 If you have used something, you'll need to figure out how to get it installed for your app or a way not to use it.

Jim.
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dsoderstromAuthor Commented:
The Windows API call was exactly what I was looking for and if fixed the problem.
It also led me to another API call for determining the user login name which I was also using the environ function to retrieve.
Everything works perfectly now.  Thank You.
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DatabaseMX (Joe Anderson - Microsoft Access MVP)Database Architect / Systems AnalystCommented:
You are welcome .
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