Abstract: A distributed system of scanning nodes is provided job portions to collectively scan network systems numbering in the tens of thousands and beyond million across the Internet. A scanning controller creates the job portions to fulfill a scanning request. The scanning controller creates the job portions based on availability of scanning nodes and a size of the scanning request (i.e., number of network addresses indicated by the request). The scanning controller creates each job portion with scanning instructions for an available scanning node to execute on a selected set of the network addresses indicated in the request, with each job portion having a different set of addresses to scan and being independently executable.

Abstract: A distributed system of scanning nodes is provided job portions to collectively scan network systems numbering in the tens of thousands and beyond million across the Internet. A scanning controller creates the job portions to fulfill a scanning request. The scanning controller creates the job portions based on availability of scanning nodes and a size of the scanning request (i.e., number of network addresses indicated by the request). The scanning controller creates each job portion with scanning instructions for an available scanning node to execute on a selected set of the network addresses indicated in the request, with each job portion having a different set of addresses to scan and being independently executable.

Abstract: A system for scanning a network includes an interface and a processor. The interface is configured to receive an indication to scan a set of network addresses. The processor is configured to determine a set of available scanning nodes and determine a job plan for scanning the set of network addresses using the set of available scanning nodes. The job plan includes one or more job portions. The processor is configured to, for a job portion of the one or more job portions, select a scanning node of the set of available scanning nodes and provide the job portion to the scanning node.

Abstract: A system for scanning a network includes an interface and a processor. The interface is configured to receive an indication to scan a set of network addresses. The processor is configured to determine a set of available scanning nodes and determine a job plan for scanning the set of network addresses using the set of available scanning nodes. The job plan includes one or more job portions. The processor is configured to, for a job portion of the one or more job portions, select a scanning node of the set of available scanning nodes and provide the job portion to the scanning node.

Abstract: A method for treating a substrate having a layer or coating of material thereon (such as for example a metal conductor coated with an insulating ‘enamel’) comprises the steps of directing a pulsed beam of laser radiation at the substrate to cause an interaction or adjacent the interface between the layer or coating and the substrate, leading to local separation of the layer or coating. The removal is effected by creating an interaction effect at the interface between the substrate and the layer or coating to create an effect similar to a shockwave which causes local separation of the layer or coating at the interface.

Abstract: A server computer updates client computers' copies of subscription files stored on a network. The server computer retrieves a database record from a subscription database. The database record includes at least client computer and subscription file information. The server computer checks the subscription file stored on the network for any changes which may have occurred to the file since the previous checking of the subscription file preferably by comparing the last save time stamp to a time stamp on the subscription file stored on the network. If changes have occurred, the server computer creates an update file for the client computer and transmits the update file to the client computer, preferably by electronic mail. Each database record may further contain a check interval indicating the periodicity of the checking of the subscription file for changes. The database record may further contain a time last checked field which is updated each time the subscription file is checked for changes.

Abstract: A server computer generates an update file for transmission to a client computer that permits the client computer to generate a copy of a current version of a subscription file from a copy of an earlier version of the subscription file. For each segment of the current version of the subscription file, the server computer searches an earlier version of a signature list for an old segment signature which matches a new segment signature corresponding to the segment. When a match is detected, the server computer writes a command in the update file for the client computer to copy an old segment of the client computer's copy of the earlier version of the subscription file into the client computer's copy of the current version of the subscription file, where the old segment corresponds to the segment for which a match was detected.

Abstract: A server computer generates an update file for transmission to a client computer that permits the client computer to generate a copy of a current version of a subscription file from a copy of an earlier version of the subscription file. For each segment of the current version of the subscription file, the server computer searches an earlier version of a signature list for an old segment signature which matches a new segment signature corresponding to the segment. When a match is detected, the server computer writes a command in the update file for the client computer to copy an old segment of the client computer's copy of the earlier version of the subscription file into the client computer's copy of the current version of the subscription file, where the old segment corresponds to the segment for which a match was detected.

Abstract: A photopolymerizable composition for making screen printing stencils. The composition comprises polyvinyl alcohol having at least one photocrosslinkable group appended thereto. At least one metal salt, wherein the metal is selected from: aluminum, zinc, chromium, zirconium, titanium, tin or iron, is added to the composition. The metal salt is used to improve water resistance of a screen printing image that is prepared from the photopolymerizable composition.

Abstract: Photopolymerizable grafted polyvinyl alcohols including groups of formula ##STR1## wherein n represents zero or an integer from 1 to 6, m represents zero or 1 (with the proviso that m represents zero when n represents zero), Z together with the nitrogen and carbon atoms to which they are attached represent a heterocyclic ring optionally fused to one or more benzenoid or heterocyclic rings, X.sup.- represents an anion, R' represents an alkyl group, and p represents an integer from 1 to 4. Compositions containing such grafted polyvinyl alcohols, for example for screen printing stencils, have shown high sensitivity to light.

Abstract: Photopolymerizable polyvinyl alcohols including a group of formula ##STR1## wherein R.sub.1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a hydrogen atom; R.sub.2 represents a substituted or unsubstituted alkyl group, a primary, secondary or tertiary amino group, a cyano, hydroxy or nitro group, a halogen or hydrogen atom or, together with the pyridine ring to which it is attached, part of a quinolyl group; R.sub.3 represents a chlorine or hydrogen atom or, together with the benzene ring to which it is attached, part of a naphthyl group; and X.sup.- represents an anion, and photocurable compositions for producing screen printing stencils including such polyvinyl alcohol derivatives. Compositions of the invention show high light sensitivity with low levels of photocrosslinkable groups grafted to the polyvinyl alcohol.

Abstract: This invention relates to a screen printing stencil composition which comprises (a) a stabilized aqueous dispersion of a water insoluble addition copolymer having units of formulas: A and B where A is preferably a polyvinyl acetate group and B is preferably a polyvinyl n-methylol acrylamide group and B comprises about 3% by weight of the copolymer; (b) a water soluble colloid; and (c) a photosensitizer: The composition is useful in the formation of a screen printing stencil, the composition having both a long stable profile and forming a durable stencil; the composition on exposure through a photographic positive can be developed with water and cross-linked with acid.

Abstract: The invention provides new compositions which change color on exposure to actinic radiation and contain a photosensitive onium, e.g. iodonium or sulphonium, salt and a dyestuff which changes color when protonated. The compositions may also include a resin, especially a resin curable by the onium salt when the latter is exposed, and preferably an epoxy resin. The compositions are useful especially as coatings, e.g. for making screen stencils or for producing lithographic printing plates.

Abstract: Aqueous dispersions comprising water, a cationically curable compound, and a photosensitive onium salt, and preferably other ingredients such as sensitizers, fillers, and plasticizers, are useful for making printing screens, lithographic plates, and printed circuit resists. After exposure, the un-cured composition is easily removed by washing with water.