Click above to get retro games delivered to your door ever month!

   dBsee sets up the expression that allows to evaluate a relational field
   automatically. The Space Bar allows you to display and eventually
   modify the expression set. The Alt-1 keys allow to insert functions or
   variables within the expression. The variables must have been previously
   defined in the Symbols environment. The functions can, however, be defined
   directly in this context by using Ins.