updated docs

docs/cpp/pages/main.md

@@ -2,14 +2,18 @@
 
 [TOC]
 
-svZeroDPlus is an application for performing different tasks with 0D hemodynamic
-computer models. It is written in C++ to enable the
-highest performance. It also offers a Python API for easily integrating it into
-other routines.
-
-* <a href="https://github.com/StanfordCBCL/svZeroDPlus">Source
-repository</a>
-* <a href="https://simvascular.github.io">About SimVascular</a>
+svZeroDPlus is an application for performing simulations with 0D/lumped-parameter
+computer models for cardiovascular flows. 
+
+Some noteworthy features of svZeroDPlus are:
+*It is completely modular. Users can create custom flow models by arranging 
+modular blocks corresponding to blood vessels, junctions, different types 
+of boundary conditions, etc. 
+*It is written in C++ to enable high-performance applications.
+*It offers both a Python API and a C++ shared library to interface with other 
+Python or C++-based applications. 
+*This allows svZeroDPlus to be used in a fully coupled manner with other multi-physics solvers,
+and for parameter estimation, uncertainty quantification, etc.
 
 Zero-dimensional (0D) models
 are lightweight methods to simulate bulk hemodynamic quantities in the
@@ -29,6 +33,10 @@ anatomies. These 0D models are governed by differential algebraic equations
 For more background information on 0D models, have a look at SimVascular's
 [ROM Simulation Guide](http://simvascular.github.io/docsROMSimulation.html).
 
+* <a href="https://github.com/StanfordCBCL/svZeroDPlus">Source
+repository</a>
+* <a href="https://simvascular.github.io">About SimVascular</a>
+
 # Installation
 
 svZeroDPlus can be installed in two different ways. For using the Python
@@ -92,12 +100,18 @@ svzerodsolver tests/cases/steadyFlow_RLC_R.json result_steadyFlow_RLC_R.csv
 
 The result will be written to a csv file.
 
-### In Python
+### From other programs
 
 For some applications it is beneficial to run svZeroDSolver directly
-from within another Python application. This can, for example, be
+from within another program. For example, this can be
 useful when many simulations need to be performed (e.g. for 
-calibration, uncertainty quantification, ...). Please make sure that
+calibration, uncertainty quantification, ...). It is also allows using
+svZeroDPlus with other solvers, for example as boundary conditions or
+forcing terms.
+
+#### In Python
+
+Please make sure that
 you installed svZerodPlus via pip to enable this feature. We start by
 importing svzerodplus:
 
@@ -146,6 +160,12 @@ solver.get_single_result_avg("flow:INFLOW:branch0_seg0")
 >>> 5.0
 ```
 
+#### In C++
+
+SvZeroDPlus needs to be built using CMake to use the shared library interface.
+
+Detailed examples of interfacing with svZeroDPlus from C++ codes are available 
+in the test cases at `svZeroDPlus/tests/test_interface`. 
 
 ## Configuration (file)