|Data type||Range||Default value|
|REG_DWORD||0 | 1||0|
Determines whether serial ports can be set to the same interrupt request level (IRQ). Some ports do not work properly if two ports have the same IRQ.
|0||Each serial port on the computer must have a different IRQ.|
|1||Serial ports on the computer can have the same IRQ.|
The value of this entry is used as the default value for all serial ports on the computer. Settings for specific serial ports are stored in the device-specific subkey for that port in the Enum subkey (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum).
To change this value, you must edit the registry. To change the PermitShare setting for a specific serial port, use Device Manager.