[SLUG] ask 2 questions

[henry]

Dear List :           1. How do I open a file with filename ***.ps.gz ?                   2.             I want to  debug loadable module , but the  flow of execution jumps frequently .   I found that a tool-ddd ( introduced as follows) seems to meets my need (debug via symbolic name , single computer) http://www.cs.wm.edu/~bob/ddd-with-modules.html.   But the introduction seems too simple for me ,Do you know some tutor for it ?         BestRegards' Henry