Field help (AYSLOCFLA) 

Specify the location of directories that contains the FLASH(/X3_PUB/X3_ROOT/X3CLI/XBLOCK/FLASH) component on:

Location on the X3 server

The access to the resources located on the X3 server is made possible via the XTEND server (a specialized servlet) behaving like a proxy.

The browser:

Local location of the X3WEB server

In local mode of the X3WEB server, the root of the X3_PUB directory is located under:  \WebData\LOCAL\X3SOLUTION\X3_PUB\.
WebData represents the 'Data' directory defined upon installation of the X3WEB server.

The 'Design HTML' and X_FILES directories must be copied to this root while complying with the tree structure when in 'X3WEB server' mode.

The xtend.server.data.localpath=/data/local configuration parameter is used to define the server processing type that will be prompted to access the resources in local mode.
/data/local (default) means that an XTEND servlet reads the resources.

If you wish to delegate the access to the resources to the the Apache server (optimization):