Customize warning messages: registry value UseCustomMessages and 2 moreComputerHKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services

Policy ID: RA_Options
Scope: Computer Configuration
Supported on: At least Windows Vista
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Remote Assistance

Registry

UseCustomMessages

REG_DWORDComputer

HKLM\Software\policies\Microsoft\Windows NT\Terminal Services Current key

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\policies\Microsoft\Windows NT\Terminal Services]

; Options (use only one)
; Enabled
"UseCustomMessages"=dword:00000001
; Disabled
"UseCustomMessages"=dword:00000000

CMD

:: Options (use only one)

:: Enabled
reg add "HKLM\Software\policies\Microsoft\Windows NT\Terminal Services" /v "UseCustomMessages" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKLM\Software\policies\Microsoft\Windows NT\Terminal Services" /v "UseCustomMessages" /t REG_DWORD /d 0 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\Software\policies\Microsoft\Windows NT\Terminal Services' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\Software\policies\Microsoft\Windows NT\Terminal Services' -Name 'UseCustomMessages' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\policies\Microsoft\Windows NT\Terminal Services' -Name 'UseCustomMessages' -PropertyType DWord -Value 0 -Force | Out-Null

ShareControlMessage

REG_SZComputer

HKLM\Software\policies\Microsoft\Windows NT\Terminal Services Current key

Enabled value: Depends on the option value
Element: Display warning message before sharing control:
Value type: REG_SZ

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\policies\Microsoft\Windows NT\Terminal Services]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"ShareControlMessage"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\Software\policies\Microsoft\Windows NT\Terminal Services" /v "ShareControlMessage" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\Software\policies\Microsoft\Windows NT\Terminal Services' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\policies\Microsoft\Windows NT\Terminal Services' -Name 'ShareControlMessage' -PropertyType String -Value '<enter value>' -Force | Out-Null

ViewMessage

REG_SZComputer

HKLM\Software\policies\Microsoft\Windows NT\Terminal Services Current key

Enabled value: Depends on the option value
Element: Display warning message before connecting:
Value type: REG_SZ

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\policies\Microsoft\Windows NT\Terminal Services]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"ViewMessage"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\Software\policies\Microsoft\Windows NT\Terminal Services" /v "ViewMessage" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\Software\policies\Microsoft\Windows NT\Terminal Services' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\policies\Microsoft\Windows NT\Terminal Services' -Name 'ViewMessage' -PropertyType String -Value '<enter value>' -Force | Out-Null