Group By Concatenate Without Using XML

Is there a way to concatenate the values of a particular field together into one field for all the records in each group of a GROUP BY without using XML?

Ideally, I want to accomplish this in a stored procedure. Normally, I would handle this in the front end, but my front end is Crystal ...

For example, if my data was:
1 "A"
1 "B"
1 "C"
2 "D"
2 "E"

I want to group by the first value and concatenate the second value:
1 "A,B,C"
2 "D,E"

Very easy using code - I simply add a function to the query in Access (not very efficient, but effective), or using recordsets in the app (which is actually very efficient) except my front end is Crystal in this case .