Not sure I had an "aha erlebnis" with UNIX. I'd done some testing on a Philips PTS6000 with T.O.S. All assembler code with debugging syslod the most fun (breakpointing code which moves itself in memory). Then I was a user on VAX 11/730, 11/750 with Ultrix which was a bit of a step down. The VAXes run VMS during the week and only in weekends we could place our disk pack and boot Ultrix. Funny feeling to go home when colleagues arrive in the morning. Later "Propriety UNIX" versions based on System III, 7, V. No source. Still had shells, command line, scripts, a bit of programming in C if all else fails (or is too slow). Never liked Windows. In that sense maybe more an 'aha windows' moment to quickly forget :-) Cheers, uncle rubl