Cliff - many thanks ...
have tried & tried, but still having trouble !
successfully got the encoded value, but can't work out how exactly to include it in the request - have tried everything I can think, without luck !
sending this :
http://xyz.ab.cd.efg:hijkl
of course results in the Cortex log-on window, waiting for User Name & Password to be entered manually ...
and sending this :
http://xyz.ab.cd.efg:hijkl/api/v1/Objects/123?0=1
results in the message Invalid user or password
which seems to give a clue, but no matter how I then add in (have tried a dozen ways)
Authorisation & Basic <abcdefghijklmnopqrstuvwxyz12345=>
I get the same message - Invalid User or password