protected mode

[Gargo]

has anybody an example of program which can go into protected mode and then retuns from it

[JPLR]

Hi Gargo,

A Windows program works in userland and never have to enter protected mode and exit it.
Such behaviour could be seen in DOS programs.
An easy way to do that is to use a DOS extender, there are several the most famous IMO is HX DOS extender.

OsDev is also a nice place to find this kind of information:
http://wiki.osdev.org/Main_Page

Best regards,