Returns the value of the KEYTABLE_ID field currently in the data
       access block (DAB).

       FN$KEYTABLE_ID allows you to add other functions that access
       other capabilities of the Screen Management Guidelines (SMG) of
       the Screen Management facility.

       This function is not available in a DECwindows Motif environment.

1  –  Input

       None.

2  –  Output

       A longword value of the KEYTABLE_ID field.

3  –  Example

       DTR> DECLARE KEYTABLE LONG.
       DTR> KEYTABLE = FN$KEYTABLE_ID