Batch File to list files from two seperat networks

Hello,

I work in a factory where multiple PCs are on seperate VLANs. I need to view contents of a directory from one VLAN called "Admin" and compare it with individual directories from multiple PCs on another VLAN called "Shop" ("Shop" is not part of the Domain)

I have created a VB script that will compare two txt files and report the diffences. So I am trying to create two text files from each VLAN using a batch file. The batch file will be ran from a PC with two network cards so it can see both VLANs.

I can easily create the list from the "Admin" network using:
dir /b \\Server\Share\ > Active.txt

The "Shop" list is different. It needs a username and password. All Shop PCs have the same user name and password but I'm not sure how to structure the script to create a list from multiple PCs using a user name and password.
If I open the folders from Windows and enter the credentials then a script like this will work:
dir /b \\PC_Name1\Share > Programs.txt
dir /b \\PC_Name2\Share >> Programs.txt

Using the command above without first opening the folder and entering the credentials gives this error: Logon failure: unknown user name or bad password

Thanks in advance for any help.