Using variable for channel in file Open

I have some legacy TrueBasic files which I am supporting.

When opening a file, instead of a channel number, a variable was used.
Open iniFile: NAME "xxx", ORG TEXT, ACCESS INPUT

I have searched the documentation and cannot find this.
It looks simple. But I am wanting to find where it is described.



Found where the variable came

Found where the variable came from. It was added in a transcribed version and was not to be used in the actual source code.

My mistake.