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== PCI Devices in Windows ==In Windows, peripheral component interconnect (PCI) devices can share interrupts (IRQs) by design. Per the Plug and Play capability that is defined by the PCI specification, adapters are configured by the computer's BIOS, and are then examined by the operating system and changed if necessary. It is normal behavior for PCI devices to have IRQs shared among them, especially for Advanced Configuration and Power Interface (APCI) computers with Windows ACPI support enabled. == Unable to Change a Resource Setting in Device Manager == Device manager has the IRQ and memory addresses lock for the driver, and/or when you manually assigned an IRQ in the system bios, it is ignored by Windows because, according to Microsoft, the computer is running the Advanced Configuration and Power Interface (ACPI) Hardware Abstraction Layer (HAL). On a computer that is running the Advanced Configuration and Power Interface (ACPI) Hardware Abstraction Layer (HAL), you are not able to change a resource setting for a device in Device Manager. This behavior occurs because the ACPI HAL controls resource assignments in Windows 2000 and XP and does not permit user intervention. Microsoft does not recommend that you change the HAL that is installed during the Windows Setup process. When you change from the ACPI HAL to the Standard PC HAL, you must reinstall the operating system. ACPI functionality is then lost. In some rare instances, you may need to have control over a resource assignment. You are only able to manually configure resources in Windows when the Standard PC HAL is used, and even then you may not be able to configure the device. The device must support the ability to manually set the resources.