/* RASENTRY 'dwfOptions' bit flags.
*/
#define RASEO_UseCountryAndAreaCodes    0x00000001
#define RASEO_SpecificIpAddr            0x00000002
#define RASEO_SpecificNameServers       0x00000004
#define RASEO_IpHeaderCompression       0x00000008
#define RASEO_RemoteDefaultGateway      0x00000010
#define RASEO_DisableLcpExtensions      0x00000020
#define RASEO_TerminalBeforeDial        0x00000040
#define RASEO_TerminalAfterDial         0x00000080
#define RASEO_ModemLights               0x00000100
#define RASEO_SwCompression             0x00000200
#define RASEO_RequireEncryptedPw        0x00000400
#define RASEO_RequireMsEncryptedPw      0x00000800
#define RASEO_RequireDataEncryption     0x00001000
#define RASEO_NetworkLogon              0x00002000
#define RASEO_UseLogonCredentials       0x00004000
#define RASEO_PromoteAlternates         0x00008000
#if (WINVER >= 0x401)
#define RASEO_SecureLocalFiles          0x00010000
#endif
#if (WINVER >= 0x500)
#define RASEO_RequireEAP                0x00020000
#define RASEO_RequirePAP                0x00040000
#define RASEO_RequireSPAP               0x00080000
#define RASEO_Custom                    0x00100000

##</code><code>##

$RASOPTIONS = "RASEO_IpHeaderCompression+RASEO_RemoteDefaultGateway+RASEO_SwCompression";

##</code><code>##

my $RASOPTIONS = 0x00000008 | 0x00000010 | 0x00000200;

##</code><code>##

  0x00000008    0000 0000 0000 0000 0000 0000 0000 1000
| 0x00000010    0000 0000 0000 0000 0000 0000 0001 0000
| 0x00000200    0000 0000 0000 0000 0000 0010 0000 0000
= 0x00000218    0000 0000 0000 0000 0000 0010 0001 1000

##</code><code>##

# Set options 
# RASEO_IpHeaderCompression
# RASEO_RemoteDefaultGateway
# RASEO_SwCompression
# without affecting any other options.
$options |= 0x00000008 | 0x00000010 | 0x00000200;

# Clear those same options again leaving every other option as it was

$options &= ~(0x00000008 | 0x00000010 | 0x00000200);

# do something if all three options are set
# regardless of what other options are set.
if( ($options & (0x00000008 | 0x00000010 | 0x00000200)) ==  (0x00000008 | 0x00000010 | 0x00000200) ) {
    # do something
}

# Do something if ONLY those three options are set
if( $options == (0x00000008 | 0x00000010 | 0x00000200) ) {
   # do it
} 

##</code><code>##

use constant RASEO_IpHeaderCompression = 0x00000008;