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Case Sensitivity
The names of user defined macros, subMacros, variables and keywords such as MESSAGE, CREATE LINE, WHILE, etc. are case-insensitive. These lines are equivalent:
#example 1:
MESSAGE "hello, world"
MESSAGE "hello, world"
MESSAGE "hello, world"

#######################

#example 2:
DEFINE out AS string
DEFINE OUT AS string
Only string constants are case-sensitive:
#CORRECT:
Save "C:\temp\output.com" "CGM"

#INCORRECT:
Save "C:\temp\output.com" "cgm"