# System Parameters

'B0' | Base Zero for Level/Window

## Description

Sets zero as the base number for level and window. For WindX environments, this parameter must be set on both the client and the server.

#### Warning!
If the application is run with 'B0' set, ensure that it is set on both the UNIX host and the WindX PC. Otherwise, the wrong windows will be addressed.
Set 'B0' either by using -B0 as an argument on the WindX PC's start_up command line or as a statement from the host; i.e. EXECUTE "[wdx]SET_PARAM 'B0'".

## Default

Off - The base number for level and window is 1.

#### Note:
This setting affects the HWN( ) function, which relies on the base window number.

## See Also

HWN( ) Highest Unused Window Number