# UnMapPhysicalMemory

int UnMapPhysicalMemory (int mapHandle);

## Purpose

Unmaps an address that you mapped using MapPhysicalMemory.

Do not pass the address to this function. Instead, pass the handle that MapPhysicalMemory returned.

| Note UnMapPhysicalMemory requires the LabWindows/CVI low-level support driver. LabWindows/CVI loads the driver at startup if it is on disk. You can check whether LabWindows/CVI loaded the driver at startup by calling CVILowLevelSupportDriverLoaded.

## Parameters

Input
Name | Type | Description
mapHandle | integer | Handle that MapPhysicalMemory returns.

## Return Value

Name | Type | Description
status | integer | Indicates whether the function succeeded.
Code | Description
1 | Success.
0 | mapHandle is not valid, the operating system reported an error, or the low-level support driver is not loaded.