The aim of this package is to turn ** GAP ** more user-friendly, at least for semigroup theorists. It requires the usage of external programs as is the case of `graphviz`

[DEG+02], a software for drawing graphs developed at AT & T Labs, that can be obtained at http://www.graphviz.org/. It is used not only to draw right Cayley graphs of finite semigroups and Schüzenberger graphs of finite inverse semigroups but also to visualise in the usual way the egg-box picture of a D-classe of a finite semigroup.

**Important note**: The version of `graphviz`

to install must be greater or equal to 1.16.

Tcl/Tk should also be available in order to run the graphical interfaces

XAutomaton and XSemigroup

used to specify automata and semigroups.

**Warning**: the use of XAutomaton and XSemigroup is intended only for simple examples. After its use one may have to start another GAP session.

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