HP71B: lets come to speed

[floppy]

ah ok.
with this help? http://www.namirshammas.com/HP71B/EMU71.htm I will try later. I am now in the editor in the PC.

So far, I made 3 different functions in 1 file. More to come.

Question 1: all variables of the 3 functions will be "local" or "global"? Are all variables in BASIC local for the separate functions? (I am using the same letters A or B or C or D.. in the functions and would not like it would have collisions; in an HP41 this is clear: a register used will be used from everywhere. Not sure if the variables in HP71B are like registers in HP41 it means unique and will be overwritten from other routines).

Question 2: several functions or several subroutines can be in 1 file or they should be separated one function or one subroutine in one file?

Question 3: how many calls of calls of calls.. can make a BASIC program in HP71B?

Question 4: can make an HP71B BASIC program a call of itself? how many time?

Sorry for the weird questions but I am a beginner.