Commands in up to 3 site command tables are in effect for all applications. An option in the ISPF configuration table enables a site to specify that up to 3 site command tables are searched before or after the system command table. If the site command tables are searched first, then commands in the site command tables can override identically named commands in the system command table, and in turn can be overridden by identically named commands in the application or user command tables. If the site command tables are searched after the system command table, then their commands override no others, but can be overridden by identically named commands in either the application, user, or system command tables.

You must specify the application ID of up to 3 site command tables in the ISPF configuration table, or the site command tables cannot be used. If you do not have a site command table that matches the application ID, the ID is ignored until the table is present and ISPF is reinitialized.