I have updated the Vetasst Mobil Entry A program to allow you to use a thumb drive or any other media that can have a drive letter assigned to transfer the Datamerge file. 
Please go to www.equisoftusa.com and click download upgrade 
scroll down to the link Equisoft Vetasst_MobilA.exe V 4_3_2 
and download this file to your thumb drive so you can install it on the Mobile Entry Laptop. 
Install this program on your lap-top. Your new opening screen should then show a place to enter a Drive letter for the merge file. 
Then download the file Downloads/Vetasst DataMerge 4_3_1.EXE to your Master entry machine 
It should replace your DataMerge utility with version 4.3.1 which will allow you to specify the drive letter of the device containing your merge file. This is the drive letter assigned by Windows when you plug the thumb drive into your master entry computer. It will almost always have the same drive letter. 
To use the new DataMerge system, insert the thumb drive in your lap-top. 
Open the Vet program on your laptop and change the Merge File Drive to the drive letter that Windows gave the thumb drive. It should always be the same and the program will remember the drive letter you entered between sessions. 
Click the button named Create Merge File and the program will place that file on the thumb drive. 
Now close the program on the laptop and insert the thumb drive in the master entry machine. 
Open the DataMerge utility and change the drive letter on the screen labeled Drive Letter With Merge Files to the drive that Windows assigned to the thumb drive. Again, it should always be the same and the program will remember the setting. 
Press Select File and the list of files on the thumb drive should appear. Select the proper file and press Merge Data. 
The program should work as before. 
When you have merged the data on the master entry machine, just copy the files c:\vetasst\vetdata.mdb and c:\vetasst\maredata.mdb to the thumb drive and copy them back to the lap-top. 
When you have finished, I would delete all the files from the thumb drive to clear the slate for the next time. 
Remember not to copy any files other than vetdata.mdb and maredata.mdb between thew master entry and the lap-top.