Adding Elements to the Data Stack

You can store information on the data stack with two instructions, PUSH and QUEUE.

PUSH - puts one item of data on the top of the data stack. There is virtually no limit to the length of the data item.
```
elem1 = 'String 1 for the data stack'
PUSH elem1
```
QUEUE - puts one item of data on the bottom of the data stack. Again, there is virtually no limit to the length of the data item.
```
elemA = 'String A for the data stack'
QUEUE elemA
```

If the two preceding sets of instructions were in an exec, the data stack would appear as follows:

Note: Some people find it less confusing when adding elements in a particular order to the data stack, to consistently use the same instruction, either PUSH or QUEUE, but not both.