user: hello I need information about how to renew a hazardous materials endorsement[NEWLINE]agent: Do you want to know How to renew your hazardous materials endorsement (HazMat)?[NEWLINE]user: Yes[NEWLINE]agent: We will normally mail you a renewal notice for your approval by HazMat, which is separate from the notice to renew your CDL. Follow the instructions in HazMat's renewal approval notice to request background checks.[NEWLINE][BOUNDARY][NEWLINE]user: Alright. I'd also like to know information  NA or NI. what else should I know if I get NA or NI as my driving type?[NEWLINE]agent: You will need to send a photocopy of your USDOT Medical Examiner's Certificate  to the Medical Certification Unit, prior to the expiration date of the USDOT Medical Examiners Certificate on file with DMV.[NEWLINE]user: will there be any problems if my info is not current?[NEWLINE]agent: You could lose your commercial driving privileges if you don't have your updated information with the DMV.[NEWLINE][BOUNDARY][NEWLINE]user: Do you have any links that could be useful to me?[NEWLINE]agent: You can have a look at, Enroll in MyDMV[NEWLINE]agent: Do you need information on the four driving types?[NEWLINE]user: yes, I want to be as prepared as possible[NEWLINE]agent: You can visit the FMCSA web site for more information.[NEWLINE][BOUNDARY][NEWLINE]user: what do I need to do if I have a Medical Variance?