You can change a global parameter in a program temporarily, if you have called 'eglobpar' before.
If you need the default values again after modifications of the global
parameter, you should use the commands 'esavpar' and 'erespar'.
'esavpar' saves all global parameters and 'erespar' restores the last backup.
Please note: There are some parameter you can not change temporarily!
They are parameter like 'epsFileName' or 'pageOrientation', which initialize
the plot-file, the page and the window with the function 'eopen'.
In this case use the parameter of 'eopen'.