[PD] converting a regular message to an internal message?

[Rory Walsh]

Following on from my earlier post, I want to build an internal message
by prepending a semicolon to a regular message which I've dynamically
created. My question is how to change this

| obj_rec16 color 12 22 22 (

to this

|; obj_rec16 color 12 22 22 (

I'm guessing it's pretty easy but so far I can't seem to find a
solution. And advise is much appreciated.

Rory.