Variable declaration

[lwhistler]

In the variable declaration, I sometimes see 3 letters written in front of the varaiable (e.g., intMy_Variable) and sometimes not. The three letters preceeding the variable seems to be defining the variable type. Other letters in front are such things is cur, sin, etc. My guess is that is defining the variable type. However, my manual says that the variable declaration must be appended with As Integer, etc to define the variable type. What are those three letters that precede the variable name used for?