It's possible by using the importprivkey command.
Ok.
I have installed Bitcoin application under Windows XP, run in GUI mode.
Should I run Bitcoin from command line in off-line mode to get address generated, saved and
private, public keys saved ?
Bitcoin is not coming with any help file, on-line manual.
I am not interested to use Bitcoin for downloading blockchain.
Just testing security of Bitcoin application and the way
private and public keys, address are generated and handled and protected against
attacks by hackers (MS Windows XP).
I plan to use Bitcoin to generate private key in off-line mode
and have it saved to tangible off-line media like pendrive or CD-ROM
to not let windows applications coming with built-in keyboard logger functionality to steal
and export my private key to third parties.