Solve : Adobe Photoshop colour question?

1.	Solve : Adobe Photoshop colour question?
Answer» Hi all, Im in the process of getting some tshirts printed and have supplied all my artwork as layered .PSD files as REQUESTED. However the printer/reprographics GUY has asked for the artwork to be in Dot Colour as apposed to RGB? Is this an industry term for converting to CMYK or do I need to CONVERT it to an Illustrator file?! What am I missing, can ANYONE help?

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