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+# DIRAC for Mu3e 
+
+## User Introduction & Setup Guide
+
+This document introduces DIRAC and Mu3e and describes the initial client setup.
+
+!!! Warning
+    **Status:** Work in progress
+
+    Further sections (catalog access, job submission, data management) **are intentionally incomplete and will be extended**.
+
+### What is DIRAC?
+
+**DIRAC** (Distributed Infrastructure with Remote Agent Control) is a distributed computing framework widely used in high-energy physics and other scientific communities. It provides:
+
+* Secure authentication using X.509 certificates
+* Workload and data management across multiple computing centers
+* A unified interface for grid, cloud, and HPC resources
+
+DIRAC uses a **central Configuration Service**, a **Proxy Manager**, and multiple backend services to allow users to submit jobs and manage data securely.
+
+### What is Mu3e?
+
+**[Mu3e](https://www.psi.ch/de/mu3e)** is a particle physics experiment at the Paul Scherrer Institute (PSI) searching for the rare decay:
+```
+μ⁺ → e⁺ e⁻ e⁺
+```
+
+Mu3e relies on distributed computing resources for simulation, reconstruction, and data analysis.
+DIRAC is used as the Distributed Data Management and Workload Management System that can be used by the Mu3e experiment.
+
+## Configuring DIRAC for the Mu3e experiment
+
+### Prerequisites
+
+Before starting, you need:
+
+* A valid X.509 user certificate (and private key).
+* Access to the Mu3e DIRAC VO.
+
+### Install User Certificates
+
+DIRAC relies on standard Grid certificates. This often comes in `.p12` format, and the private key and user certificate
+should be retreived from it, as follows:
+
+```bash
+openssl pkcs12 -in my_personal_CERN_cert.p12 -clcerts -nokeys -out usercert.pem
+openssl pkcs12 -in my_personal_CERN_cert.p12 -nocerts -nodes -out userkey.pem
+```
+
+Once retrieved, place your personal certificate and private key in:
+```bash
+~/.globus
+```
+
+!!! tip
+    `userkey.pem` must be `chmod 600`
+
+### Install DIRAC Client Environment (DIRACOS)
+
+**DIRAC** provides a self-contained runtime called **DIRACOS**.
+```bash
+mkdir ~/dirac_ui
+cd ~/dirac_ui
+
+curl -LO https://github.com/DIRACGrid/DIRACOS2/releases/latest/download/DIRACOS-Linux-$(uname -m).sh
+bash DIRACOS-Linux-$(uname -m).sh
+
+rm DIRACOS-Linux-$(uname -m).sh
+```
+
+Active the environment
+```bash
+source ~/dirac_ui/diracos/diracosrc
+```
+
+Install the DIRAC Python client:
+```bash
+pip install DIRAC # Alternative DIRAC==$VERSION, e.g. DIRAC==8.0.74
+```
+
+### Install Certificate Authorities (CAs)
+
+**DIRAC** requires trusted CA certificates to validate remote services. Merlin7 does not provide CA certificates
+and users are responsible for managing and updating them.
+
+!!! warning
+    Users are responsible to maintain the CAs up to date
+
+Download the required CA bundles:
+```bash
+mkdir -p ~/Downloads
+cd ~/Downloads
+
+wget https://repository.egi.eu/sw/production/cas/1/current/tgz/ca_UKeScienceCA-2B-1.138.tar.gz
+wget https://repository.egi.eu/sw/production/cas/1/current/tgz/ca_UKeScienceRoot-2007-1.138.tar.gz
+```
+
+Install them into DIRACOS
+```bash
+cd ~/dirac_ui
+
+tar xvzf ~/Downloads/ca_UKeScienceRoot-2007-1.138.tar.gz \
+  --strip-components=1 \
+  -C diracos/etc/grid-security/certificates/
+
+tar xvzf ~/Downloads/ca_UKeScienceCA-2B-1.138.tar.gz \
+  --strip-components=1 \
+  -C diracos/etc/grid-security/certificates/
+```
+
+### Fetch Certificate Revocation Lists (CRLs)
+
+CRLs are required to ensure certificates have not been revoked.
+
+!!! warning
+    Users are responsible to maintain this list up to date.
+
+Load fetch-crl and update CRLs:
+```bash
+module use unstable
+module load fetch-crl
+
+fetch-crl -lv $HOME/dirac_ui/diracos/etc/grid-security/certificates/
+```
+
+### Initialize a Local Proxy (No Configuration Service)
+
+Create a local proxy without contacting the Configuration Service (useful for first setup and debugging):
+```bash
+dirac-proxy-init --nocs
+```
+
+### Configure DIRAC for Mu3e
+
+Configure the DIRAC client to use the GridPP setup and configuration server:
+```bash
+dirac-configure -F \
+  -S GridPP \
+  -C dips://diracweb.grid.hep.ph.ic.ac.uk:9135/Configuration/Server \
+  -I
+```
+
+Set the certificate directory explicitly (important when using DIRACOS):
+```bash
+export X509_CERT_DIR=$HOME/dirac_ui/diracos/etc/grid-security/certificates
+```
+
+### Initialize a Mu3e DIRAC Proxy
+
+Create and upload a proxy for the Mu3e VO:
+```bash
+dirac-proxy-init -g mu3e.org_user -M
+```
+
+Verify:
+```bash
+dirac-proxy-info
+```
+
+## Next Steps (Work in Progress)
+
+!!! warning
+    **WORK IN PROGRESS**, not fully documented yet
+
+    **As of today, no services are available.** What's possible and how to set it up accordingly
+    needs to be clarified with the experiment.
+
+Once the proxy and configuration are in place, users can start interacting with Mu3e's DIRAC services.
+
+### Accessing the File Catalog (WIP)
+
+DIRAC provides a File Catalog that tracks all Mu3e datasets and their replicas across storage elements.
+
+Examples of operations that will be documented:
+
+* Listing directories and files
+* Querying logical file names (LFNs)
+* Checking replicas and storage locations
+* Uploading and downloading files
+
+Tools involved include:
+
+* `dirac-dms-filecatalog-cli`
+* `dirac-dms-lfn-replicas`
+* `dirac-dms-get-file`
+
+### Submitting Jobs (WIP)
+
+DIRAC supports job submission to distributed resources using:
+
+* Job Description Language (JDL)
+* Python-based DIRAC job APIs
+* Command-line submission tools
+
+Planned topics:
+
+* Writing a minimal JDL
+* Submitting and monitoring jobs
+* Retrieving job outputs
+* Debugging failed jobs
+
+### Other DIRAC Tools (WIP)
+
+Further DIRAC components to be documented:
+
+* Data Management System (DMS)
+* Workload Management System (WMS)
+* Production system
+* Monitoring and accounting tools
diff --git a/mkdocs.yml b/mkdocs.yml
index fafcbfe..072ba30 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -118,18 +118,19 @@ nav:
     - Jupyterhub:
       - merlin7/04-Jupyterhub/jupyterhub.md
     - Software Support:
-      - merlin7/05-Software-Support/pmodules.md
-      - merlin7/05-Software-Support/spack.md
-      - merlin7/05-Software-Support/openmpi.md
       - merlin7/05-Software-Support/ansys.md
       - merlin7/05-Software-Support/ansys-rsm.md
-      - merlin7/05-Software-Support/cp2k.md
-      - merlin7/05-Software-Support/quantum-espresso.md
-      - merlin7/05-Software-Support/lammps.md
-      - merlin7/05-Software-Support/gromacs.md
-      - merlin7/05-Software-Support/opal-x.md
-      - merlin7/05-Software-Support/ippl.md
       - merlin7/05-Software-Support/cray-module.env.md
+      - merlin7/05-Software-Support/cp2k.md
+      - merlin7/05-Software-Support/dirac.md
+      - merlin7/05-Software-Support/gromacs.md
+      - merlin7/05-Software-Support/ippl.md
+      - merlin7/05-Software-Support/lammps.md
+      - merlin7/05-Software-Support/opal-x.md
+      - merlin7/05-Software-Support/openmpi.md
+      - merlin7/05-Software-Support/pmodules.md
+      - merlin7/05-Software-Support/quantum-espresso.md
+      - merlin7/05-Software-Support/spack.md
   - Merlin 6:
     - Quick Start Guide:
       - merlin6/introduction.md