Contents.
1. Generalities.
2. List of main programs with general description.
3. Instructions for use of individual programs.
4. The shell program "cohomology".
5. Examples:
a) Computation of 2-part of multiplier of m21=PSL(3,4).
b) Computation of H^2(SL(3,5),M), (M=natural module).
c) Computation of H^2(SL(5,2),M), (M=natural module).
d) computation of a presentation of the nonsplit extension of SL(3,2) on
its natural module, using a given presentation of SL(3,2).
6. Other programs.
7. Formats of PCP files.
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