Belgium 'abolished'

[Asick]

Originally Posted by Przemolog

Until 1989, communist authorities issued special passports "valid in socialist countries only". After 1989 transformations those passports were still valid. However, because 3 neighbour countries (USSR, Czechoslovakia and GDR) ceased to exist, after 1st Jan 1993 it was possible to cross the Polish border with those passports only by air (e.g. flying to Hungary)

What a Pole should have done to enter a non socialist country? Was it necessary to apply for another passport? Was it easy to cross socialist to socialist borders? In USSR people just kept passports for internal use, any foreign trips required another 'foreign' passport that you could not easily get.