Returns the current Table-Number and key name associated with this entry to str-var. The Table-number precedes the key name separated by a comma. e.g. 4,VARNAME
The table number is easily accessed via VAL(str-var)
The keyname may be accessed via REMAIN$(strvar, ",")
If successful, RC is always set to 0 and Msg$ will be "" (Null)
If unsuccessful (invalid index-num), RC will be 8, and Msg$ will contain an error message.
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