IAI America XSEL-QX - Manual (Page 145)

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Part 3 Controller Data Structure
1.6 Tags
The term “tag” means “heading.”
Tags are used in the same way you attach labels to the pages in a book you want to reference frequently.
A tag is a destination specified in a jump command “GOTO.”
Command Operand 1
TAG Tag number (Integer between 1 and 256)
They are used only in each program.
Tag
TAG 1
GOTO 1