Subject tmp_directory with classic architecture
Author Henry FRANQUET
In Interbase Configuration Parameters, Ann Harrison wrotes

"This parameter can be used an arbitrary number of times to specify
locations for temporary files. The size is in bytes If this
configuration parameter does not exist, InterBase checks the following
environmental variables: INTERBASE_TMP, TMP, and TEMP. This parameter is

available only in SuperServer."

How about managing directories in classic server ?