>I am using an array in a program and on the first pass through a method, it is possible that the array hasn't been created yet (the routine is primarily for subsequent passes). Of course I get an error when I do a ALEN on the non-existant array. I have tried various commands to see if I can check for it but they all generate an error. Is there a command that can tell if an array (or variable of anytype), exists without generating an error?

You can use TYPE() function to do that. Notice quotes around variable name.

IF TYPE("myvariable") = "U"
  * Variable/array myvariable doesn't exist
ELSE
  * It exist
ENDIF