only one instance of scite (text editor)

[WolfgangZ]

Hi,

how can I force that only one instance of scite ist used when double 
clicking on text files. It is annoying to get for each file a own 
instance of scite.

Many thanks
Wolfgang

PS: an other annoyance is that ALT+leftMouse moves the window. In scite 
this is used to mark columns. Where is definded that this command moves 
windows (a feature that I dont need).