diff --git a/pylintrc b/pylintrc
index d686a0a..1ced5a6 100644
--- a/pylintrc
+++ b/pylintrc
@@ -3,9 +3,10 @@ good-names=pytestmark
 
 [DESIGN]
 max-args=14
-max-locals=27
+max-locals=28
 max-attributes=8
 max-statements=65
+min-similarity-lines=6
 
 [MESSAGES CONTROL]
 disable=redefined-outer-name
diff --git a/test/test_alt.py b/test/test_compat_alt.py
similarity index 94%
rename from test/test_alt.py
rename to test/test_compat_alt.py
index 10315ae..466e7fc 100644
--- a/test/test_alt.py
+++ b/test/test_compat_alt.py
@@ -87,7 +87,9 @@ def test_alt(runner, yadm_y, paths,
                                encrypt=encrypt, exclude=exclude)
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -188,7 +190,9 @@ def test_wild(request, runner, yadm_y, paths,
                            encrypt=encrypt, exclude=False)
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -211,7 +215,9 @@ def test_wild(request, runner, yadm_y, paths,
                            encrypt=encrypt, exclude=False)
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -249,7 +255,9 @@ def test_local_override(runner, yadm_y, paths,
         paths, '##or-class.or-os.or-hostname.or-user')
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -287,7 +295,9 @@ def test_class_case(runner, yadm_y, paths, tst_sys, suffix):
         utils.create_alt_files(paths, f'##{ending}')
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -320,7 +330,9 @@ def test_auto_alt(runner, yadm_y, paths, autoalt):
     utils.create_alt_files(paths, suffix)
 
     # run status to possibly trigger linking
-    run = runner(yadm_y('status'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('status'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -356,7 +368,9 @@ def test_delimiter(runner, yadm_y, paths,
     utils.create_alt_files(paths, suffix)
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -396,7 +410,9 @@ def test_invalid_links_removed(runner, yadm_y, paths):
     utils.create_alt_files(paths, f'##{tst_class}')
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
@@ -418,7 +434,9 @@ def test_invalid_links_removed(runner, yadm_y, paths):
     utils.set_local(paths, 'class', 'changedclass')
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     linked = linked_list(run.out)
diff --git a/test/test_jinja.py b/test/test_compat_jinja.py
similarity index 94%
rename from test/test_jinja.py
rename to test/test_compat_jinja.py
index 54d248a..342d202 100644
--- a/test/test_jinja.py
+++ b/test/test_compat_jinja.py
@@ -50,7 +50,9 @@ def test_local_override(runner, yadm_y, paths,
     # os.system(f'find {paths.work}' + ' -name *j2 -ls -exec cat \'{}\' ";"')
     # os.system(f'find {paths.work}')
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     created = created_list(run.out)
@@ -83,7 +85,9 @@ def test_auto_alt(runner, yadm_y, paths, autoalt, tst_sys,
     utils.create_alt_files(paths, jinja_suffix, content='{{ YADM_OS }}')
 
     # run status to possibly trigger linking
-    run = runner(yadm_y('status'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('status'), env=env)
     assert run.success
     assert run.err == ''
     created = created_list(run.out)
@@ -111,6 +115,7 @@ def test_jinja_envtpl_missing(runner, paths):
         process_global_args -Y "{paths.yadm}"
         set_operating_system
         configure_paths
+        YADM_COMPATIBILITY=1
         ENVTPL_PROGRAM='envtpl_missing' main alt
     """
 
@@ -170,7 +175,9 @@ def test_jinja(runner, yadm_y, paths,
                            includefile=True)
 
     # run alt to trigger linking
-    run = runner(yadm_y('alt'))
+    env = os.environ.copy()
+    env['YADM_COMPATIBILITY'] = '1'
+    run = runner(yadm_y('alt'), env=env)
     assert run.success
     assert run.err == ''
     created = created_list(run.out)
diff --git a/test/test_cygwin_copy.py b/test/test_cygwin_copy.py
index 82b08ba..92141e3 100644
--- a/test/test_cygwin_copy.py
+++ b/test/test_cygwin_copy.py
@@ -4,6 +4,8 @@ import os
 import pytest
 
 
+@pytest.mark.parametrize(
+    'compatibility', [True, False], ids=['compat', 'no-compat'])
 @pytest.mark.parametrize(
     'setting, is_cygwin, expect_link, pre_existing', [
         (None, False, True, None),
@@ -28,7 +30,8 @@ import pytest
 @pytest.mark.usefixtures('ds1_copy')
 def test_cygwin_copy(
         runner, yadm_y, paths, cygwin_sys, tst_sys,
-        setting, is_cygwin, expect_link, pre_existing):
+        setting, is_cygwin, expect_link, pre_existing,
+        compatibility):
     """Test yadm.cygwin_copy"""
 
     if setting is not None:
@@ -49,6 +52,10 @@ def test_cygwin_copy(
         expected_content = f'test_cygwin_copy##{cygwin_sys}'
     env = os.environ.copy()
     env['PATH'] = ':'.join([str(uname_path), env['PATH']])
+    if compatibility:
+        env['YADM_COMPATIBILITY'] = '1'
+    else:
+        pytest.xfail('Alternates 2.0.0 has not been implemented.')
 
     run = runner(yadm_y('alt'), env=env)
     assert run.success
diff --git a/yadm b/yadm
index b4e56c1..0918938 100755
--- a/yadm
+++ b/yadm
@@ -135,31 +135,51 @@ function alt() {
   require_repo
   parse_encrypt
 
+  local local_class
   local_class="$(config local.class)"
+
+  local local_system
+  local_system="$(config local.os)"
+  if [ -z "$local_system" ] ; then
+    local_system="$OPERATING_SYSTEM"
+  fi
+
+  local local_host
+  local_host="$(config local.hostname)"
+  if [ -z "$local_host" ] ; then
+    local_host=$(hostname)
+    local_host=${local_host%%.*} # trim any domain from hostname
+  fi
+
+  local local_user
+  local_user="$(config local.user)"
+  if [ -z "$local_user" ] ; then
+    local_user=$(id -u -n)
+  fi
+
+  if [ "$YADM_COMPATIBILITY" = "1" ]; then
+    alt_past
+  else
+    alt_future
+  fi
+
+}
+
+function alt_future() {
+  # Future alternate processing, not implemented yet
+  return
+}
+
+function alt_past() {
+
   if [ -z "$local_class" ] ; then
     match_class="%"
   else
     match_class="$local_class"
   fi
   match_class="(%|$match_class)"
-
-  local_system="$(config local.os)"
-  if [ -z "$local_system" ] ; then
-    local_system="$OPERATING_SYSTEM"
-  fi
   match_system="(%|$local_system)"
-
-  local_host="$(config local.hostname)"
-  if [ -z "$local_host" ] ; then
-    local_host=$(hostname)
-    local_host=${local_host%%.*} # trim any domain from hostname
-  fi
   match_host="(%|$local_host)"
-
-  local_user="$(config local.user)"
-  if [ -z "$local_user" ] ; then
-    local_user=$(id -u -n)
-  fi
   match_user="(%|$local_user)"
 
   # regex for matching "<file>##CLASS.SYSTEM.HOSTNAME.USER"