Local variables to multiple procedures in an il file

Hi,

I have an il file which consists of two procedures, it looks like this:

procedure( myProcedureA()

                let((varA varB)

                     procedureB()

                   ) )

procedure( myProcedureB()

                let((varC varD)

                     skill coding...

                   ) )

in this case, varA and varB belong to prcedureA while varC and varD belong to procedureB.

after either procedureA or B is executed, they become "unbound", which means at Skill Shell, we type

"Skill> println(varA) " we shall get an "unbound variable" message.

I want to have a glabal variable (that's say varE) which can be shared by both procedures A and B,

However, I want to make it local to A and B only, which means after A and B are executed (since A will call B),

when we type "Skill> println(varE)" it shall produce an "unbound variable" message. 

How shall I go with it? Thanks~