🚀 go-pugleaf

        Does anybody out there knows how to get back to the
        display manager while in the GPR borrow mode and return
        excution of my program in borrow mode when I hit a key?
        
        Any help will be appreciated.

I use some variation of the procedure below to do this.  It doesn't 
return to your program on any key; the user has to type ^Z to exit
the sub-shell.  You can do (almost) anything you want to instead of the 
pgm_$invoke call, though.  Waiting for "any key" isn't well defined
if you have released the display, but you could wait for any key in 
your own window...

If you have already written procedures to acquire and release the
display and to enable and disable events processing, the procedure below
should not be hard to fit into your program.

                                --- Jonathan

..decvax!yale!young-jonathan
               young-jonathan@yale.arpa

PROCEDURE Suspend;
var
    ec : ec2_$ptr_t;
    status : status_$t;
begin
    Save_Cursor;
    Save_Screen;
    Disable_Events;
    Release_Display;

    writeln ('*** Pushed shell -- do ^Z to get back into <program> ***');
    pgm_$invoke ('/com/sh', 7, 0, nil, 0, nil, [pgm_$wait], ec, status);

    Acquire_Display;
    Enable_Events;
    Refresh_Screen;
    Refresh_Cursor;
end;