Before making any changes to a system file, create a backup. The original termsrv.dll resides in C:\Windows\System32 . While the patching tool automatically creates a backup (usually named termsrv.dll.backup ) when it runs, it is wise to manually copy the file to another folder as well. This extra step gives you a second copy to fall back on if something goes wrong.
In the context of Windows 7 64-bit, patching is slightly more complex than on 32-bit systems. The 64-bit architecture introduces a security feature known as Kernel Patch Protection (PatchGuard), which prevents software, even device drivers, from patching the kernel. However, the TermSrv patch operates by modifying the termsrv.dll file on the disk or in memory before the kernel fully initializes the service. The patch typically identifies the specific byte sequences within the 64-bit DLL that correspond to session limits and replaces them with code that allows unlimited concurrent sessions. By removing the restriction, the operating system essentially "forgets" to enforce the one-user limit, allowing multiple users to interact with the desktop environment simultaneously, each with their own isolated session settings. universal termsrv patch windows 7 64 bit
Obtain the "Universal Termsrv Patch" from a reputable tech archive. Before making any changes to a system file, create a backup
If you are uncomfortable modifying termsrv.dll directly, the is a popular alternative. This extra step gives you a second copy
The , developed by DeepXW, is a popular third-party utility designed to bypass this limitation. What is termsrv.dll?