param (
    [string]$ipAddress,
    [string]$message
)

# Function to check if a computer is online
function Test-ComputerOnline {
    param (
        [string]$ipAddress
    )
    $ping = Test-Connection -ComputerName $ipAddress -Count 1 -Quiet
    return $ping
}

# Check if the target IP is online
if (Test-ComputerOnline -ipAddress $ipAddress) {
    try {
        msg.exe * /server:$ipAddress $message
        Write-Output "Message sent to $ipAddress"
    } catch {
        Write-Output "Failed to send message to $ipAddress"
    }
} else {
    Write-Output "$ipAddress is not online"
}